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<!DOCTYPE html><head> <meta http-equiv="Content-Type"
content="text/html; charset=utf-8"
/>
<title></title>
<style type="text/css"></style>
<script type="text/javascript">
window.onload = function
() {
var
oUl = document.getElementById("ul1");
if
(oUl.firstElementChild) {
//谷歌浏览器
oUl.firstElementChild.style.background = "red";
}
if
(oUl.firstChild) {
//IE 浏览器
oUl.firstChild.style.background = "red";
}
}
</script>
</head><body> <ul id="ul1">
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
</body></html> |
IE 有firstChild所以是true，相反的，谷歌没有，会返回undifined