(function () {
class Barrage {
constructor(id) {
this.domList = [];
this.dom = document.querySelector('#' + id);
if (this.dom.style.position == '' || this.dom.style.position == 'static') {
this.dom.style.position = 'relative';
}
this.dom.style.overflow = 'hidden';
let rect = this.dom.getBoundingClientRect();
this.domWidth = rect.right - rect.left;
this.domHeight = rect.bottom - rect.top;
}
// 发送弹幕
shoot(text) {
let div = document.createElement('div');
div.style.position = 'absolute';
div.style.left = this.domWidth + 'px';
div.style.top = (this.domHeight - 20) * +Math.random().toFixed(2) + 'px';
div.style.whiteSpace = 'nowrap';
div.style.color = '#' + Math.floor(Math.random() * 256).toString(10);
div.innerText = text;
this.dom.appendChild(div);
let roll = (timer) => {
let now = +new Date();
roll.last = roll.last || now;
roll.timer = roll.timer || timer;
let left = div.offsetLeft;
let rect = div.getBoundingClientRect();
if (left < (rect.left - rect.right)) {
this.dom.removeChild(div);
} else {
if (now - roll.last >= roll.timer) {
roll.last = now;
left -= 3;
div.style.left = left + 'px';
}
requestAnimationFrame(roll);
}
}
roll(50 * +Math.random().toFixed(2));
}
}
// 获取整个屏幕的宽高
let barage = new Barrage('content');
console.log(barage.shoot);
function appendList(text) {
let p = document.createElement('p');
p.innerText = text;
document.querySelector('#content-text').appendChild(p);
}
document.querySelector('#send').onclick = () => {
let text = document.querySelector('#text').value;
barage.shoot(text);
appendList(text);
};
// 所有的弹幕
const textList = ['蜘蛛侠', '666', '233333333', 'javascript', 'html', 'css', '前端框架', 'Vue', 'React', 'Angular',
'钢铁侠'
];
textList.forEach((s) => {
barage.shoot(s);
// 向右侧弹幕添加发送过的弹幕
appendList(s);
})
})();
