F.ready(function() {  

    // 你的代码  

});

 F.ready(function () {
            var searchClientID = ‘<%= TextBox1.ClientID %>‘;
//            alert(searchClientID);
            var ClientIDKey = F(searchClientID);
            ClientIDKey.on("focus", function (e) {
                alert(‘得光标时‘);
                Txt_Onfocus(searchClientID); //文本获得光标时

            });
            ClientIDKey.on("blur", function (e) {
                Txt_Onblur(); //文本失去光标时
            });
            ClientIDKey.on("keyup", function (e) {
                Txt_OnkeyUp(); //放开键时
            });
            ClientIDKey.on("keydown", function (e) {//写实现逻辑
                Txt_OnkeyDown(); //按下键时
            });

FineUI4.0以后如何调用JS事件