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前端代码分享——星空背景特效（内含源码）

2023-07-29 442
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简介： 前端代码分享——星空背景特效（内含源码）


运行演示



打开网页效果最好哦

提供的JavaScript代码是一个名为"WarpDrive"的jQuery插件，它创建了一个星空动画，类似于科幻媒体（如《星际迷航》）中所看到的"超光速"效果。


核心代码


( function() {
    function WarpDrive( element, params ) {
        var settings = {};
            settings.width = 480;
            settings.height = 480;
            settings.autoResize = false;
            settings.autoResizeMinWidth = null;
            settings.autoResizeMaxWidth = null;
            settings.autoResizeMinHeight = null;
            settings.autoResizeMaxHeight = null;
            settings.addMouseControls = true;
            settings.addTouchControls = true;
            settings.hideContextMenu = true;
            settings.starCount = 6666;
            settings.starBgCount = 2222;
            settings.starBgColor = { r:255, g:255, b:255 };
            settings.starBgColorRangeMin = 10;
            settings.starBgColorRangeMax = 40;
            settings.starColor = { r:255, g:255, b:255 };
            settings.starColorRangeMin = 10;
            settings.starColorRangeMax = 100;
            settings.starfieldBackgroundColor = { r:0, g:0, b:0 };
            settings.starDirection = 1;
            settings.starSpeed = 20;
            settings.starSpeedMax = 200;
            settings.starSpeedAnimationDuration = 2;
            settings.starFov = 300;
            settings.starFovMin = 200;
            settings.starFovAnimationDuration =  2;
            settings.starRotationPermission = true;
            settings.starRotationDirection = 1;
            settings.starRotationSpeed = 0.0;
            settings.starRotationSpeedMax = 1.0;
            settings.starRotationAnimationDuration = 2;
            settings.starWarpLineLength = 2.0;
            settings.starWarpTunnelDiameter = 100;
            settings.starFollowMouseSensitivity = 0.025;
            settings.starFollowMouseXAxis = true;
            settings.starFollowMouseYAxis = true;
        //---
        if ( params !== undefined ) {
            for ( var prop in params ) {
                if ( params.hasOwnProperty( prop ) && settings.hasOwnProperty( prop ) ) {
                    settings[ prop ] = params[ prop ];
                }
            }
        }
        //---
        for ( var prop in settings ) {
            if ( settings.hasOwnProperty( prop ) && prop.indexOf( 'Duration' ) > -1 ) {
                settings[ prop ] = settings[ prop ] * 60;
            }
        }
        if ( typeof settings.starBgColor === 'string' && settings.starBgColor.indexOf( '#' ) > -1 ) {
            settings.starBgColor = hexToRgb( settings.starBgColor );
        } else if ( typeof settings.starBgColor === 'string' && settings.starBgColor.indexOf( 'rgb' ) > -1 ) {
            settings.starBgColor = parseRGBString( settings.starBgColor );
        }
        if ( typeof settings.starColor === 'string' && settings.starColor.indexOf( '#' ) > -1 ) {
            settings.starColor = hexToRgb( settings.starColor );
        } else if ( typeof settings.starColor === 'string' && settings.starColor.indexOf( 'rgb' ) > -1 ) {
            settings.starColor = parseRGBString( settings.starColor );
        }
        if ( typeof settings.starfieldBackgroundColor === 'string' && settings.starfieldBackgroundColor.indexOf( '#' ) > -1 ) {
            settings.starfieldBackgroundColor = hexToRgb( settings.starfieldBackgroundColor );
        } else if ( typeof settings.starfieldBackgroundColor === 'string' && settings.starfieldBackgroundColor.indexOf( 'rgb' ) > -1 ) {
            settings.starfieldBackgroundColor = parseRGBString( settings.starfieldBackgroundColor );
        }
        if ( !element ) {
            throw Error( '\n' + 'No div element found' );
        }
        //---
        var MATHPI180 = Math.PI / 180;
        var MATHPI2 = Math.PI * 2;
        var canvasWidth = settings.width;
        var canvasHeight = settings.height;
        var starCount = settings.starCount;
        var starBgCount = settings.starBgCount;
        var starBgColor = settings.starBgColor;
        var starBgColorRangeMin = settings.starBgColorRangeMin
        var starBgColorRangeMax = settings.starBgColorRangeMax
        var starColor = settings.starColor;
        var starColorRangeMin = settings.starColorRangeMin;
        var starColorRangeMax = settings.starColorRangeMax;
        var starfieldBackgroundColor = settings.starfieldBackgroundColor;
        var starDirection = settings.starDirection;
        var starSpeed = settings.starSpeed;
        var starSpeedMin = starSpeed;
        var starSpeedMax = settings.starSpeedMax;
        var starSpeedAnimationDuration = settings.starFovAnimationDuration;
        var starSpeedAnimationTime = 0;
        var starFov = settings.starFov;
        var starFovMin = settings.starFovMin;
        var starFovMax = starFov;
        var starFovAnimationDuration =  settings.starFovAnimationDuration;
        var starFovAnimationTime = starFovAnimationDuration;
        var starRotation = 0.0;
        var starRotationPermission = settings.starRotationPermission;
        var starRotationDirection = settings.starRotationDirection;
        var starRotationSpeed = settings.starRotationSpeed;
        var starRotationSpeedMin = starRotationSpeed;
        var starRotationSpeedMax = settings.starRotationSpeedMax;
        var starRotationAnimationDuration = settings.starRotationAnimationDuration;
        var starRotationAnimationTime = 0;
        var starWarpLineLength = settings.starWarpLineLength;
        var starWarpTunnelDiameter = settings.starWarpTunnelDiameter;
        var starFollowMouseSensitivity = settings.starFollowMouseSensitivity;
        var starFollowMouseXAxis = settings.starFollowMouseXAxis;
        var starFollowMouseYAxis = settings.starFollowMouseYAxis;
        var starDistance = 8000;
        var starBorderFront = -starFovMin + 1;
        var starBorderBack = starDistance;
        var starHolder;
        var starBgHolder;
        var starColorLookupTable;
        var starBgColorLookupTable;
        var canvas, ctx, imageData, pix;
        var center;
        var mouseActive;
        var mouseDown;
        var mousePos;
        var paused = false;
        //---
        function init() {
            canvas = document.createElement( 'canvas' );
            canvas.style.backgroundColor = rgbToHex( starfieldBackgroundColor.r, starfieldBackgroundColor.g, starfieldBackgroundColor.b );
            canvas.setAttribute( 'width', canvasWidth );
            canvas.setAttribute( 'height', canvasHeight );
            if ( settings.addMouseControls ) {
                canvas.addEventListener( 'mousemove', mouseMoveHandler, false );
                canvas.addEventListener( 'mousedown', mouseDownHandler, false );
                canvas.addEventListener( 'mouseup', mouseUpHandler, false );
                canvas.addEventListener( 'mouseenter', mouseEnterHandler, false ); 
                canvas.addEventListener( 'mouseleave', mouseLeaveHandler, false ); 
            }
            if ( settings.addTouchControls ) {
                canvas.addEventListener( 'touchstart', touchStartHandler, false );
                canvas.addEventListener( 'touchend', touchEndHandler, false );
                canvas.addEventListener( 'touchmove', touchMoveHandler, false );
                canvas.addEventListener( 'touchcancel', touchCancelHandler, false );
            }
            if ( settings.hideContextMenu ) {
                canvas.oncontextmenu = function( e ) {
                    e.preventDefault();
                };
            }
            element.appendChild( canvas );
            //---
            ctx = canvas.getContext( '2d' );
            imageData = ctx.getImageData( 0, 0, canvasWidth, canvasHeight );
            pix = imageData.data;
            //---
            center = { x:canvas.width / 2, y:canvas.height / 2 };
            mouseActive = false;
            mouseDown = false;
            mousePos = { x:center.x, y:center.y };
            //---
            starColorLookupTable = [];
            starBgColorLookupTable = [];
            starHolder = [];
            starBgHolder = [];
            addColorLookupTable( starColorLookupTable, starColorRangeMin, starColorRangeMax, starfieldBackgroundColor, starColor );
            addColorLookupTable( starBgColorLookupTable, starBgColorRangeMin, starBgColorRangeMax, starfieldBackgroundColor, starBgColor );
            addStars();
            animloop();
            //---
            if ( settings.autoResize ) {
                window.addEventListener( 'resize', resizeHandler );
                resize();
            }
        };
        //---
        Math.easeInQuad = function( t, b, c, d ) {
            return c * t * t / ( d * d ) + b;
        };
        Math.easeOutQuad = function( t, b, c, d ) {
            return -c * t * t / ( d * d ) + 2 * c * t / d + b;
        };
        //---
        //http://stackoverflow.com/questions/5560248/programmatically-lighten-or-darken-a-hex-color-or-rgb-and-blend-colors
        function shadeBlend( p, c0, c1 ) {
            var n = p < 0 ? p * -1 : p, u = Math.round, w = parseInt;
            var f = w( c0.slice( 1 ), 16 ), t = w( ( c1 ? c1 : p < 0 ? '#000000' : '#FFFFFF' ).slice( 1 ), 16 ), R1 = f >> 16, G1 = f >> 8 & 0x00FF, B1 = f & 0x0000FF;
            return '#' + ( 0x1000000 + ( u ( ( ( t >> 16 ) - R1 ) * n ) + R1 ) * 0x10000 + ( u ( ( ( t >> 8 & 0x00FF ) - G1 ) * n ) + G1 ) * 0x100 + ( u ( ( ( t & 0x0000FF ) - B1 ) * n ) + B1 ) ).toString( 16 ).slice( 1 );
        };
        //---
        //http://stackoverflow.com/questions/5623838/rgb-to-hex-and-hex-to-rgb
        function hexToRgb( hex ) {
            var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
            hex = hex.replace( shorthandRegex, function( m, r, g, b ) {
                return r + r + g + g + b + b;
            } );
            var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec( hex );
            return result ? {
                r: parseInt( result[ 1 ], 16 ),
                g: parseInt( result[ 2 ], 16 ),
                b: parseInt( result[ 3 ], 16 )
            } : null;
        };
        function rgbToHex( r, g, b ) {
            var rgb = b | ( g << 8 ) | ( r << 16 );
            return '#' + ( 0x1000000 + rgb ).toString( 16 ).slice( 1 );
        };
        //---
        function parseRGBString( rgbString ) {
            rgbString = rgbString.replace( /\s+/g, '' );
            var rgbValues = rgbString.split( '(' )[ 1 ].split( ')' )[ 0 ].split( ',' );
            return { r:rgbValues[ 0 ], g:rgbValues[ 1 ], b:rgbValues[ 2 ] };
        }
        //---
        function clearImageData() {
            for ( var i = 0, l = pix.length; i < l; i += 4 ) {
                pix[ i ]     = starfieldBackgroundColor.r;
                pix[ i + 1 ] = starfieldBackgroundColor.g;
                pix[ i + 2 ] = starfieldBackgroundColor.b;
                pix[ i + 3 ] = 0;
            }
        };
        function setPixelAdditive( x, y, r, g, b, a ) {
            var i = ( x + y * canvasWidth ) * 4;
            pix[ i ]     = pix[ i ]     + r;
            pix[ i + 1 ] = pix[ i + 1 ] + g;
            pix[ i + 2 ] = pix[ i + 2 ] + b;
            pix[ i + 3 ] = a;
        };
        //---
        function drawLine( x1, y1, x2, y2, r, g, b, a ) {
            var dx = Math.abs( x2 - x1 );
            var dy = Math.abs( y2 - y1 );
            var sx = ( x1 < x2 ) ? 1 : -1;
            var sy = ( y1 < y2 ) ? 1 : -1;
            var err = dx - dy;
            var lx = x1;
            var ly = y1;    
            while ( true ) {
                if ( lx > -1 && lx < canvasWidth && ly > -1 && ly < canvasHeight ) {
                    setPixelAdditive( lx, ly, r, g, b, a );
                }
                if ( ( lx === x2 ) && ( ly === y2 ) )
                    break;
                var e2 = 2 * err;
                if ( e2 > -dx ) { 
                    err -= dy; 
                    lx += sx; 
                }
                if ( e2 < dy ) { 
                    err += dx; 
                    ly += sy; 
                }
            }
        };
        //---
        function addColorLookupTable( colorLookupTable, colorRangeMin, colorRangeMax, colorRGBStart, colorRGBEnd ) {
            var colorHexStart = rgbToHex( colorRGBStart.r, colorRGBStart.g, colorRGBStart.b );
            var colorHexEnd   = rgbToHex( colorRGBEnd.r, colorRGBEnd.g, colorRGBEnd.b );
            var colorRange = [];
            var colorEndValues = [];
            var percent;
            var i, l, j, k;
            for ( i = 0, l = 100; i <= l; i++ ) {
                percent = i / 100;
                colorRange.push( shadeBlend( percent, colorHexStart, colorHexEnd ) );
            }
            for ( i = 0, l = colorRangeMax - colorRangeMin; i <= l; i++ ) {
                var index = i + colorRangeMin;
                colorEndValues.push( colorRange[ index ] );
            }
            for ( i = 0, l = colorEndValues.length; i < l; i++ ) {
                colorRange = [];
                for ( j = 0, k = 100; j <= k; j++ ) {
                    percent = j / 100;
                    colorRange.push( hexToRgb( shadeBlend( percent, colorHexStart, colorEndValues[ i ] ) ) );
                }
                colorLookupTable.push( colorRange );
            }
        };
        //---
        function getStarPosition( radius, sideLength ) {
            var x = Math.random() * sideLength - ( sideLength / 2 );
            var y = Math.random() * sideLength - ( sideLength / 2 );
            if ( radius > 0 ) {
                while ( Math.sqrt( x * x + y * y ) < radius ) {
                    x = Math.random() * sideLength - ( sideLength / 2 );
                    y = Math.random() * sideLength - ( sideLength / 2 );
                }
            }
            return { x:x, y:y };
        };
        function addStar( x, y, z, ox, oy, oz ) {
            var star = {};
                star.x = x;
                star.y = y;
                star.z = z;
                star.ox = ox;
                star.oy = oy;
                star.x2d = 0;
                star.y2d = 0;
            return star;
        };
        function addStars() {
            var i;
            var x, y, z;
            var star, starPosition;
            for ( i = 0; i < starBgCount; i++ ) {
                starPosition = getStarPosition( 0, 20000 );
                x = starPosition.x;
                y = starPosition.y;
                z = Math.round( Math.random() * starDistance );
                star = addStar( x, y, z, x, y, z );
                star.colorIndex = Math.floor( Math.random() * starBgColorLookupTable.length );
                star.colorLookupTable = starBgColorLookupTable[ star.colorIndex ];
                star.color = star.colorLookupTable[ Math.floor( Math.random() * 100 ) ];
                starBgHolder.push( star );
            }
            for ( i = 0; i < starCount; i++ ) {
                starPosition = getStarPosition( starWarpTunnelDiameter, 10000 );
                x = starPosition.x;
                y = starPosition.y;
                z = Math.round( Math.random() * starDistance );
                star = addStar( x, y, z, x, y, z );
                star.distance = starDistance - z;
                star.distanceTotal = Math.round( starDistance + starFov );
                star.colorIndex = Math.floor( Math.random() * starColorLookupTable.length );
                star.colorLookupTable = starColorLookupTable[ star.colorIndex ];
                star.color = star.colorLookupTable[ Math.floor( ( star.distance / star.distanceTotal ) * 100 ) ];
                starHolder.push( star );
            }
        };
        //---
        window.requestAnimFrame = ( function() {
            return  window.requestAnimationFrame       ||
                    window.webkitRequestAnimationFrame ||
                    window.mozRequestAnimationFrame    ||
                    function( callback ) {
                        window.setTimeout( callback, 1000 / 60 );
                    };
        } )();
        function animloop() {
            requestAnimFrame( animloop );
            if ( !paused ) {
                render();
            }
        };
        //---
        function render() {
            clearImageData();
            //---
            var i, j, l, k, m, n;
            //---
            var star;
            var scale;
            //---
            if ( starRotationPermission ) {
                if ( mouseDown ) {
                    starRotationAnimationTime += 1;
                    if ( starRotationAnimationTime > starRotationAnimationDuration )
                        starRotationAnimationTime = starRotationAnimationDuration;
                } else {
                    starRotationAnimationTime -= 1;
                    if ( starRotationAnimationTime < 0 )
                        starRotationAnimationTime = 0;
                }
                starRotationSpeed = Math.easeOutQuad( starRotationAnimationTime, starRotationSpeedMin, starRotationSpeedMax, starRotationAnimationDuration );
                starRotation -= starRotationSpeed * starRotationDirection;
            }
            //---
            if ( mouseActive ) {
                starSpeedAnimationTime += 1;
                if ( starSpeedAnimationTime > starSpeedAnimationDuration )
                    starSpeedAnimationTime = starSpeedAnimationDuration;
                starFovAnimationTime -= 1;
                if ( starFovAnimationTime < 0 )
                    starFovAnimationTime = 0;
                //---
                if ( starFollowMouseXAxis ) {
                    center.x += ( mousePos.x - center.x ) * starFollowMouseSensitivity;
                }
                if ( starFollowMouseYAxis ) {
                    center.y += ( mousePos.y - center.y ) * starFollowMouseSensitivity;
                }
            } else {
                starSpeedAnimationTime -= 1;
                if ( starSpeedAnimationTime < 0 )
                    starSpeedAnimationTime = 0;
                starFovAnimationTime += 1;
                if ( starFovAnimationTime > starFovAnimationDuration )
                    starFovAnimationTime = starFovAnimationDuration;
                //---
                if ( starFollowMouseXAxis ) {
                    center.x += ( ( canvas.width / 2 ) - center.x ) * starFollowMouseSensitivity;
                }
                if ( starFollowMouseYAxis ) {
                    center.y += ( ( canvas.height / 2 ) - center.y ) * starFollowMouseSensitivity;
                }
            }
            starSpeed = Math.easeOutQuad( starSpeedAnimationTime, 0, starSpeedMax - starSpeedMin, starSpeedAnimationDuration ) + starSpeedMin;
            starFov = Math.easeInQuad( starFovAnimationTime, 0, starFovMax - starFovMin, starFovAnimationDuration ) + starFovMin;
            //---
            starBorderFront = -starFov + 1;
            //---
            var warpSpeedValue = starSpeed * ( starSpeed / ( starSpeedMax / starWarpLineLength ) );
            //---
            //stars bg
            for ( i = 0, l = starBgHolder.length; i < l; i++ ) {
                star = starBgHolder[ i ];
                scale = starFov / ( starFov + star.z ); 
                star.x2d = ( star.x * scale ) + center.x; 
                star.y2d = ( star.y * scale ) + center.y; 
                if ( star.x2d > -1 && star.x2d < canvasWidth && star.y2d > -1 && star.y2d < canvasHeight ) {
                    setPixelAdditive( star.x2d | 0, star.y2d | 0, star.color.r, star.color.g, star.color.b, 255 );
                }
            }
            //---
            //stars moving
            for ( i = 0, l = starHolder.length; i < l; i++ ) {
                star = starHolder[ i ];
                //---
                //star distance calc
                star.distanceTotal = Math.round( starDistance + starFov );
                //---
                //star movement
                if ( starDirection >= 0 ) {
                    star.z -= starSpeed;
                    star.distance += starSpeed;
                    if ( star.z < starBorderFront ) {
                        star.z = starBorderBack;
                        star.distance = 0;
                    }  
                } else {
                    star.z += starSpeed;
                    star.distance -= starSpeed;
                    if ( star.z > starBorderBack ) {
                        star.z = starBorderFront;
                        star.distance = star.distanceTotal;
                    }
                }
                //---
                //star color
                star.color = star.colorLookupTable[ Math.floor( ( star.distance / star.distanceTotal ) * 100 ) ];
                //---
                //star position & draw
                scale = starFov / ( starFov + star.z ); 
                star.x2d = ( star.x * scale ) + center.x; 
                star.y2d = ( star.y * scale ) + center.y; 
                if ( starSpeed === starSpeedMin ) {
                    if ( star.x2d > -1 && star.x2d < canvasWidth && star.y2d > -1 && star.y2d < canvasHeight ) {
                        setPixelAdditive( star.x2d | 0, star.y2d | 0, star.color.r, star.color.g, star.color.b, 255 );
                    }
                } else {
                    var nz = star.z + warpSpeedValue;
                    scale = starFov / ( starFov + nz ); 
                    var x2d = ( star.x * scale ) + center.x; 
                    var y2d = ( star.y * scale ) + center.y; 
                    if ( x2d > -1 && x2d < canvasWidth && y2d > -1 && y2d < canvasHeight ) {
                        drawLine( star.x2d | 0, star.y2d | 0, x2d | 0, y2d | 0, star.color.r, star.color.g, star.color.b, 255 );
                    }
                }
                //---
                //star rotation
                if ( starRotationSpeed !== starRotationSpeedMin ) {
                    var radians = MATHPI180 * starRotation;
                    var cos = Math.cos( radians );
                    var sin = Math.sin( radians );
                    star.x = cos * star.ox + sin * star.oy;
                    star.y = cos * star.oy - sin * star.ox;
                }
            }
            //---
            ctx.putImageData( imageData, 0, 0 );
        };
        function resizeHandler( event ) {
            resize();
        };
        function resize() {
            canvasWidth = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth;
            canvasHeight = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
            if ( settings.autoResizeMinWidth && canvasWidth < settings.autoResizeMinWidth ) {
                canvasWidth = settings.autoResizeMinWidth;
            } else if ( settings.autoResizeMaxWidth && canvasWidth > settings.autoResizeMaxWidth ) {
                canvasWidth = settings.autoResizeMaxWidth;
            }
            if ( settings.autoResizeMinHeight && canvasHeight < settings.autoResizeMinHeight ) {
                canvasHeight = settings.autoResizeMinHeight;
            } else if ( settings.autoResizeMaxHeight && canvasHeight > settings.autoResizeMaxHeight ) {
                canvasHeight = settings.autoResizeMaxHeight;
            }
            //---
            canvas.setAttribute( 'width', canvasWidth );
            canvas.setAttribute( 'height', canvasHeight );
            center = { x:canvas.width / 2, y:canvas.height / 2 };
            //---
            imageData = ctx.getImageData( 0, 0, canvasWidth, canvasHeight );
            pix = imageData.data;
        };
        //---
        function mouseMoveHandler( event ) {
            mousePos = getMousePos( canvas, event );
        };
        function mouseEnterHandler( event ) {
            mouseActive = true;
        };
        function mouseLeaveHandler( event ) {
            mouseActive = false;
            mouseDown = false;
        };
        function mouseDownHandler( event ) {
            mouseDown = true;
        };
        function mouseUpHandler( event ) {
            mouseDown = false;
        };
        //---
        function getMousePos( canvas, event ) {
            var rect = canvas.getBoundingClientRect();
            return { x: event.clientX - rect.left, y: event.clientY - rect.top };
        };
        //---
        function touchStartHandler( event ) {
            event.preventDefault();
            mouseDown = true;
            mouseActive = true;
        };
        function touchEndHandler( event ) {
            event.preventDefault();
            mouseDown = false;
            mouseActive = false;
        };
        function touchMoveHandler( event ) {
            event.preventDefault();
            mousePos = getTouchPos( canvas, event );
        };
        function touchCancelHandler( event ) {
            mouseDown = false;
            mouseActive = false;
        };
        //---
        function getTouchPos( canvas, event ) {
            var rect = canvas.getBoundingClientRect();
            return { x: event.touches[ 0 ].clientX - rect.left, y: event.touches[ 0 ].clientY - rect.top };
        };
        //---
        this.pause = function() {
            paused = true;
        };
        this.unpause = function() {
            paused = false;
        };
        //---
        init();
    };
    window.WarpDrive = WarpDrive;
} () );
if ( typeof jQuery !== 'undefined' ) {
    ( function( $ ) {
        $.fn.warpDrive = function( params ) {
            var args = arguments;
            return this.each( function() {
                if ( !$.data( this, 'plugin_WarpDrive' ) ) {
                    $.data( this, 'plugin_WarpDrive', new WarpDrive( this, params ) );
                } else {
                    var plugin = $.data( this, 'plugin_WarpDrive' );
                    if ( plugin[ params ] ) {
                        plugin[ params ].apply( this, Array.prototype.slice.call( args, 1 ) );
                    } else {
                        $.error( 'Method ' +  params + ' does not exist on jQuery.warpDrive' );
                    }
                }
            } );
        };
    } ( jQuery ) );
}

提供的JavaScript代码是一个名为"WarpDrive"的jQuery插件，它创建了一个星空动画，类似于科幻媒体（如《星际迷航》）中所看到的"超光速"效果。

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