<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<script>
var simple = function(){
this.getId = function(elementId){
var element = document.getElementById(elementId);
//alert(elementId);
return element;
}
}var $ = function(string){
var sim = new simple();
var start = string.indexOf("#");
if(start != -1)
{
start += 1;
var str = string.substring(start);
return sim.getId(str);
}
else
{
return null;
}
}alert($("#e"));
</script>
</head><body>
<input type="text" id="e" value="1234" />
</body>
</html>怎么返回不了ID为e的DOM对象的?
我哪里出错了?
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<script>
var simple = function(){
this.getId = function(elementId){
var element = document.getElementById(elementId);
//alert(elementId);
return element;
}
}var $ = function(string){
var sim = new simple();
var start = string.indexOf("#");
if(start != -1)
{
start += 1;
var str = string.substring(start);
return sim.getId(str);
}
else
{
return null;
}
}alert($("#e"));
</script>
</head><body>
<input type="text" id="e" value="1234" />
</body>
</html>怎么返回不了ID为e的DOM对象的?
我哪里出错了?
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<script>
var simple = function(){
this.getId = function(elementId){
var element = document.getElementById(elementId);
//alert(elementId);
return element;
}
}
var $ = function(string){
var sim = new simple();
var start = string.indexOf("#");
if(start != -1)
{
start += 1;
var str = string.substring(start);
return sim.getId(str);
}
else
{
return null;
}
}
//alert($("#e"));
window.onload=function(){alert($("#e"));}
</script>
</head>
<body>
<input type="text" id="e" value="1234" />
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<script>
var simple = function(){
this.getId = function(elementId){
var element = document.getElementById(elementId);
//alert(elementId);
return element;
}
}
var $ = function(string){
var sim = new simple();
var start = string.indexOf("#");
if(start != -1)
{
start += 1;
var str = string.substring(start);
return sim.getId(str);
}
else
{
return null;
}
}
</script>
</head>
<body>
<input type="text" id="e" value="1234" />
<script type="text/javascript">
(function() {
alert($("#e"));
})();
</script>
</body>
</html>