折翼的天使，CSS深入理解之absolute教程-慕课网

index.html
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>折翼的天使</title>
<style>
input[type=button] {
    height: 32px;
    font-size: 100%;    
}
</style>
</head>
 
<body>
<img src="http://img1.sycdn.imooc.com//54447b06000171a002560191.jpg">
<img src="http://img1.sycdn.imooc.com//54447f4a0001eb7d01910256.jpg">
<img src="http://img1.sycdn.imooc.com//54447f550001ccb002560191.jpg">
<p><input type="button" id="button" value="点击第2张图片应用position:absolute变天使"></p>
<script>
var button = document.getElementById("button"),
    image2 = document.getElementsByTagName("img")[1];
if (button && image2) {
	var value_init = button.value;
	button.onclick = function() {
		if (this.value == value_init) {
			image2.style.position = "absolute";
			this.value = "撤销";
		} else {
			image2.style.position = "";
			this.value = value_init;
		}
	};
}
</script>
</body>
</html>
折翼的天使

任务
