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js的delegate回调例子

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<!DOCTYPE html><html><head lang="en">    <meta charset="UTF-8">    <title></title>    <!-- jQuery文件。务必在bootstrap.min.js 之前引入 -->    <script src="http://cdn.bootcss.com/jquery/1.11.1/jquery.min.js"></script></head><body></body></html><script>    var CCaller =    {        createNew: function()        {            var instance = {};            instance.delegate = null;            instance.call = function(x)            {                if ( null != instance.delegate)                {                    instance.delegate.interfaceFuncImpl(x);                }            };            return instance;        }    };    var CInterfaceFuncImpl = {        createNew: function()        {            var instance = {};            instance.interfaceFuncImpl = function(arg)            {                alert(arg);            };            return instance;        }    };    $(document).ready(function() {        caller = CCaller.createNew();        testImpl = CInterfaceFuncImpl.createNew();        caller.delegate = testImpl;        caller.call("asdasdasd");    });</script>