<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script src="js/jquery.js"></script>
<script>
window.onload = function(){
document.getElementById('btnok').onclick = function(){
//1.通过匹配div1的所有span后代元素
//$('.div1 span').html('test');
//2.匹配div元素的所有span元素
//$('div > span').html('test');
//3.匹配div紧邻的div元素
//$('.div1 + div').html('test');
//4.匹配div1紧邻的所有div元素
$('.div1 ~ div').html('test');
}
}
</script>
</head>
<body>
<input type="button" id="btnok" value="匹配" />
<hr />
<div class="div1">
<span>第一个span标签噢</span>
<div>
<span>span元素，第一个div元素的后代元素</span>
</div>
</div>
<div class="div2">
<span>第二个div的子元素</span>
</div>
<div class="div3">div3</div>
</body>
</html>
