延迟加载J文件

<script type="text/javascript "> $(function() { wsqJs.public(); }) // 延迟加载 functio

<script type="text/javascript ">
    $(function() {
            wsqJs.public();
        })
        // 延迟加载
    function downloadJSAtOnload() {
        var element = document.createElement("script ");
        element.src = "js/public.js "; //延迟加载的文件，多个文件无效
        document.body.appendChild(element);
    }
    if (window.addEventListener)
        window.addEventListener("load ", downloadJSAtOnload, false);
    else if (window.attachEvent)
        window.attachEvent("onload ", downloadJSAtOnload);
    else window.onload = downloadJSAtOnload;
</script>