1、$(function(){
$("#a").click(function(){
//adding your code here
});
});
2、$(document).ready(function(){
$("#a").click(function(){
//adding your code here
});
});
3、window.onload = function(){
$("#a").click(function(){
//adding your code here
});
}
html代码为<input type="button" id="a">点击</input>,且页面需要引用jquery的js文件