页面加载完成后执行JS的方式

 <script type="text/javascript">
        window.onload = function () {
            //方法内容
        }
    </script>

script type=”text/javascript”>
        $(document).ready(function (){
            var test="123qew";
            alert(test);
        });
    </script>

    <script type="text/javascript">
        $(function () {
            alter("123qew");
        })
    </script>