js callback 回调函数.html

<input type="button" value="回调" onclick="callbackTest()"><script type="text/javascript">function callbackTest(){    alert("a do sth before callback");    var lc_callback=function (data){alert("balabalabala... callback return data:"+data);    }    kk(lc_callback); /*if(window.kSubimt) window.kSubmit(lc_callback);*/    alert("a do sth afer callback");}//another window  /*window.kSubmit=function (callbackFunc){....}*/function kk(callbackFunc){    alert("s");    if(callbackFunc) callbackFunc("哈哈");    alert("b");}</script><button onClick=test()>click me</button><script language="javascript" type="text/javascript"> function a(callback) {        alert("我是parent函数a！");     callback();     alert("over");} function b(){     alert("我是回调函数b");  } function c(){     alert("我是回调函数c"); } function test() {     a(b);     a(c); } </script>