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@@ -0,0 +1,73 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+ <head>
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+ <meta charset="UTF-8" />
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0" />
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+ <title>Document</title>
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+ <style>
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+ img {
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+ position: absolute;
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+ }
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+ </style>
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+ </head>
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+ <body>
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+ <script>
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+ var screenWidth =
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+ document.body.clientWidth || document.documentElement.clientWidth;
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+ var screenHeight =
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+ document.body.clientHeight || document.documentElement.clientHeight;
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+
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+ // 构造函数中写属性
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+ function Leaf() {
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+ // 图片的宽度
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+ this.width = Math.random() * 100 + 100; //100~200
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+ // 图片距离顶部位置
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+ this.tops = 0;
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+ // 图片距离左侧的位置
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+ this.newLeft = Math.random() * (screenWidth - this.width);
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+ // 图片的路径
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+ this.newImg = "./img/" + Math.floor(Math.random() * 4 + 1) + ".png";
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+ }
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+
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+ //原型上写方法 初始化树叶
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+ Leaf.prototype.init = function() {
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+ // 创建标签
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+ var imgs = document.createElement("img");
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+ // 给图片路径
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+ imgs.src = this.newImg;
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+ imgs.style.width = this.width + 'px';
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+ imgs.style.top = this.tops + 'px';
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+ imgs.style.left = this.newLeft + 'px';
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+ this.img = imgs;
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+ document.body.appendChild(imgs);
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+ }
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+ // 页面展示图片
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+ var newArr = [];
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+ for(var i=0;i<20;i++) {
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+ var newLeaf = new Leaf();
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+ newArr.push(newLeaf);
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+ newLeaf.init();
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+ }
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+ // 下落树叶的方法
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+ Leaf.prototype.fall = function() {
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+ setTimeout(function(){
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+ var timer = setInterval(function(){
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+ if(this.img.offsetTop < screenHeight - this.img.offsetHeight) {
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+ this.img.style.top = this.img.offsetTop + 10 + 'px';
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+ } else {
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+ clearInterval(timer);
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+ }
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+ console.log(this)
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+ }.bind(this),20)
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+ }.bind(this)
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+ ,Math.random()*2000)
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+ }
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+ // 点击树叶下落
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+ document.onclick = function() {
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+ for(var i=0;i<newArr.length;i++) {
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+ newArr[i].fall();
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+ }
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+ }
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+ </script>
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+ </body>
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+</html>
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e
