front-end-learning/js-snow-3-me.html at master · dirstart/front-end-learning · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style type="text/css">
		div,body{
			margin: 0;
			padding: 0;
		}
		#snow-bg{
			width: 800px;
			height: 800px;
			background: #231123;
		}
		.snow{
			width: 10px;
			height: 10px;
			background: #fff;
			border-radius: 50%;
			position: absolute;
			animation: mysnow 10s;
		}
		@keyframes mysnow{
			0%{opacity: 0;}
			50%{opacity: 1;}
			100%{opacity: 0;}
		}
	</style>
</head>
<script type="text/javascript">
	window.onload=function(){
		var curtain=document.getElementById("snow-bg");
		var maxWidth=curtain.clientWidth;
		var maxHeight=curtain.clientHeight;
		var snowProp=[];//用于保存每一个雪花
		var snowDiv=[];//用于保存每个雪花Div

		var snow=function(){};

		snow.prototype.init=function(){
			setInterval(function(){
			var o={
				positionX:Math.random()*maxWidth,
				positionY:Math.random()*50,
				speed:Math.random()*10,
				shake:Math.random()*2+(-1),
			};
			var oDiv=document.createElement("div");
			oDiv.style.top=o.positionY+"px";
			oDiv.style.left=o.positionX+"px";
			oDiv.className="snow";
			curtain.appendChild(oDiv);

			snowProp.push(o);
			snowDiv.push(oDiv);
			}	,400);
		};
		//失败品，正确的做法应该是先描述一个雪花的动作，然后量产，而不是一次性产生好多雪花一起来控制他们的行为
		snow.prototype.move=function(){

		}

		var snowObj=new snow();
		snowObj.init();


// 	window.requestAnimFrame = (function() {
// 				return window.requestAnimationFrame ||
// 					window.webkitRequestAnimationFrame ||
// 					window.mozRequestAnimationFrame ||
// 					function(callback) {
// 						window.setTimeout(callback, 1000 / 60);
// 					};
// })();

	}
</script>
<body>
	<div id="snow-bg"></div>
</body>
</html>