为什么不响应onclick
<!DO
CTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="">
<head>
<script>
document.getElementById("ttt").onclick = y1;
function y1()
{
window.open("test.jpg","test","height=400,width=400,menubar=no,location=yes,Resizable=no");
return false;
}
</script>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<a href="#" id="ttt">link1</a>
</body>
</html>
------解决方案--------------------必须写在这些元素之后
============
在这些元素加载之后执行