unction getByClass(clsName, parent){
//定义函数getByClass()实现获取document或指定父元素下所有class为on的元素
var elements=parent?document.getElementById(parent).getElementsByTagName("*"):document.getElementsByTagName("*");;
var arr=[];
for(var i=0;i<elements.length;i++){
if(elements[i].className==clsName){
arr.push(elements[i]);
}
}
return arr;
}
2015-12-07
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<ul id="list">
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
</ul>
<p>class为on的p标签</p>
</body>
</html>
<script type="text/javascript">
window.onload=function(){
var len1= getByClass('on','list');
alert(len1.length); // 结果等于2为正确
var len2= getByClass('on');
alert(len2.length); // 结果等于3为正确
}
function getByClass(clsName, parent){
//定义函数getByClass()实现获取document或指定父元素下所有class为on的元素
var oparent = parent?document.getElementById(parent):document;
var elements = oparent.getElementsByTagName('*');
var result = [];
for(var i=0;i<elements.length;i++){
if(elements[i].className == clsName){
result.push(elements[i]);
}
}
return result;
}
</script><!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<ul id="list">
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
</ul>
<p>class为on的p标签</p>
</body>
</html>
<script type="text/javascript">
window.onload=function(){
var len1= getByClass('on','list');
alert(len1.length); // 结果等于2为正确
var len2= getByClass('on');
alert(len2.length); // 结果等于3为正确
}
function getByClass(clsName, parent){
//定义函数getByClass()实现获取document或指定父元素下所有class为on的元素
var child;
if(parent!=null){
child=document.getElementById(parent).getElementsByTagName("*");
}else{
child=document.getElementsByTagName("*");
}
var onarry=[];
for(var i=0;i<child.length;i++){
if(child[i].className==clsName){
onarry.push(child[i]);
}
}
return onarry;
}
</script>
举报
