js&jquery页面加载完执行

js

<script type=”text/javascript”>

window.onload=function (){

    var userName=”xiaoming”;

    alert(userName);

}
</script>

jquery(在DOM加载完就可以执行（比window.onload更早）。在同一页面中可以多次出现.ready())

<script type=”text/javascript”>

$(document).ready(function (){

    var userName=”xiaoming”;

    alert(userName);

});
</script>