scriptloader.loadscripts cannot be called while the scriptloader is already loading scripts解决办法

在页面中加入如下脚本

 <script type="text/javascript" language="javascript">
    var prm = Sys.WebForms.PageRequestManager.getInstance();
    prm.add_initializeRequest(initializeRequest);
    prm.add_endRequest(endRequest);
    var postbackElement;
    function initializeRequest(sender, args) {
        document.body.style.cursor = "wait";
        if (prm.get_isInAsyncPostBack()) {
            args.set_cancel(true);
        }
    }
    function endRequest(sender, args) {
        document.body.style.cursor = "default";
    }
    </script>