原文链接：http://www.cnblogs.com/henw/archive/2011/12/19/2293585.html
需求：自定义一个弹出登陆框的界面，主要特点有隐藏hide()，显示show()，浏览器窗口改变大小触发事件resize(),计算屏幕居中位置等功能。
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//设置物体居中
Base.prototype.center=
function
(width,height){
var
top=(document.documentElement.clientHeight-height)/2;
var
left=(document.documentElement.clientWidth-width)/2;
for
(
var
i=0;i<
this
.elements.length;i++){
this
.elements[i].style.top=top+
'px'
;
this
.elements[i].style.left=left+
'px'
;
}
return
this
;
}
//当浏览器改变窗口大小的时候，触发事件
Base.prototype.resize=
function
(){
window.onresize=fn;
return
this
;
}
/*
前台调用
var login=$().getId('login');
//登录框
login.center(350,250).resize(function(){
login.center(350,250);
});
//弹出登录框
$().getClass('login').click(function(){
login.css('display','block');
});
//登录框关闭按钮
$().getClass('close').click(function(){
login.css('display','none');
});
*/
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基础库：
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//前台调用
var
$ =
function
(_this) {
return
new
Base(_this);
}
//基础库
function
Base(_this) {
//创建一个数组，来保存获取的节点和节点数组
this
.elements = [];
if
(_this != undefined) {
//_this是一个对象，undefined也是一个对象，区别与typeof返回的带单引号的'undefined'
this
.elements[0] = _this;
}
}
//获取ID节点
Base.prototype.getId =
function
(id) {
this
.elements.push(document.getElementById(id));
return
this
;
};
//获取元素节点数组
Base.prototype.getTagName =
function
(tag) {
var
tags = document.getElementsByTagName(tag);
for
(
var
i = 0; i < tags.length; i ++) {
this
.elements.push(tags[i]);
}
return
this
;
};
//获取CLASS节点数组
Base.prototype.getClass =
function
(className, idName) {
var
node =
null
;
if
(arguments.length == 2) {
node = document.getElementById(idName);
}
else
{
node = document;
}
var
all = node.getElementsByTagName(
'*'
);
for
(
var
i = 0; i < all.length; i ++) {
if
(all[i].className == className) {
this
.elements.push(all[i]);
}
}
return
this
;
}
//获取某一个节点
Base.prototype.getElement =
function
(num) {
var
element =
this
.elements[num];
this
.elements = [];
this
.elements[0] = element;
return
this
;
};
//设置CSS
Base.prototype.css =
function
(attr, value) {
for
(
var
i = 0; i <
this
.elements.length; i ++) {
if
(arguments.length == 1) {
if
(
typeof
window.getComputedStyle !=
'undefined'
) {
//W3C
return
window.getComputedStyle(
this
.elements[i],
null
)[attr];
}
else
if
(
typeof
this
.elements[i].currentStyle !=
'undeinfed'
) {
//IE
return
this
.elements[i].currentStyle[attr];
}
}
this
.elements[i].style[attr] = value;
}
return
this
;
}
//添加Class
Base.prototype.addClass =
function
(className) {
for
(
var
i = 0; i <
this
.elements.length; i ++) {
if
(!
this
.elements[i].className.match(
new
RegExp(
'(\s|^)'
+className +
'(\s|$)'
))) {
this
.elements[i].className +=
' '
+ className;
}
}
return
this
;
}
//移除Class
Base.prototype.removeClass =
function
(className) {
for
(
var
i = 0; i <
this
.elements.length; i ++) {
if
(
this
.elements[i].className.match(
new
RegExp(
'(\s|^)'
+className +
'(\s|$)'
))) {
this
.elements[i].className =
this
.elements[i].className.replace(
new
RegExp(
'(\s|^)'
+className +
'(\s|$)'
),
' '
);
}
}
return
this
;
}
//添加link或style的CSS规则
Base.prototype.addRule =
function
(num, selectorText, cssText, position) {
var
sheet = document.styleSheets[num];
if
(
typeof
sheet.insertRule !=
'undefined'
) {
//W3C
sheet.insertRule(selectorText +
'{'
+ cssText +
'}'
, position);
}
else
if
(
typeof
sheet.addRule !=
'undefined'
) {
//IE
sheet.addRule(selectorText, cssText, position);
}
return
this
;
}
//移除link或style的CSS规则
Base.prototype.removeRule =
function
(num, index) {
var
sheet = document.styleSheets[num];
if
(
typeof
sheet.deleteRule !=
'undefined'
) {
//W3C
sheet.deleteRule(index);
}
else
if
(
typeof
sheet.removeRule !=
'undefined'
) {
//IE
sheet.removeRule(index);
}
return
this
;
}
//设置innerHTML
Base.prototype.html =
function
(str) {
for
(
var
i = 0; i <
this
.elements.length; i ++) {
if
(arguments.length == 0) {
return
this
.elements[i].innerHTML;
}
this
.elements[i].innerHTML = str;
}
return
this
;
}
//设置鼠标移入移出方法
Base.prototype.hover =
function
(over, out) {
for
(
var
i = 0; i <
this
.elements.length; i ++) {
this
.elements[i].onmouseover = over;
this
.elements[i].onmouseout = out;
}
return
this
;
};
//设置显示
Base.prototype.show =
function
() {
for
(
var
i = 0; i <
this
.elements.length; i ++) {
this
.elements[i].style.display =
'block'
;
}
return
this
;
}
//设置隐藏
Base.prototype.hide =
function
() {
for
(
var
i = 0; i <
this
.elements.length; i ++) {
this
.elements[i].style.display =
'none'
;
}
return
this
;
}
//设置物体居中
Base.prototype.center =
function
(width, height) {
var
top = (document.documentElement.clientHeight - height) / 2;
var
left = (document.documentElement.clientWidth - width) / 2;
for
(
var
i = 0; i <
this
.elements.length; i ++) {
this
.elements[i].style.top = top +
'px'
;
this
.elements[i].style.left = left +
'px'
;
}
return
this
;
}
//触发点击事件
Base.prototype.click =
function
(fn) {
for
(
var
i = 0; i <
this
.elements.length; i ++) {
this
.elements[i].onclick = fn;
}
return
this
;
}
//触发浏览器窗口事件
Base.prototype.resize =
function
(fn) {
window.onresize = fn;
return
this
;
}
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本文转自 小旭依然 51CTO博客，原文链接:http://blog.51cto.com/xuyran/1886527
