javascript - 兼容IE8的getElementsByClassName为何会报错？
代码
因为getElementByClassName不兼容IE8，如下function封装了支持IE8的getElementByClassName函数
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<p class="haha">
dddddddddd
<p class="wawa">
ggggggg
</p>
</p>
<script>
function getElementsByClassName(element, names) {
if (element.getElementsByClassName) {
return element.getElementsByClassName(names);
} else {
var elements = element.getElementsByTagName('*');
var result = [];
var element,
classNameStr,
flag;
names = names.split(' ');
for (var i = 0; element = elements[i]; i++) {
classNameStr = ' ' + element.className + ' ';
flag = true;
for (var j = 0, name; name = names[j]; j++) {
if (classNameStr.indexOf(' ' + name + '') == -1) {
flag = false;
break;
}
}
if (flag) {
result.push(element);
}
}
return result;
}
}
var t=getElementsByClassName(document,'haha');
var b=getElementsByClassName(t,'wawa');
console.log(t);
console.log(b);
</script>
</body>
</html>
报错
Uncaught TypeError: element.getElementsByTagName is not a function
请问问题出在哪？
