extjs源码分析-012(Funtion扩展)

Ext.apply(Function.prototype, {     //创建拦截器,也就是在函数执行想运行拦截器,当拦截器返回false则不往下执行      /*var sayHi = function(name){       alert('Hi, ' + name);     }     var sayHiToFriend = sayHi.createInterceptor(function(name){       return name == 'Brian';     });          */     createInterceptor : function(fcn, scope){        var method = this;        return !Ext.isFunction(fcn) ?                this :                function() {                    var me = this,                        args = arguments;                    fcn.target = me;                    fcn.method = method;                    return (fcn.apply(scope || me || window, args) !== false) ?                            method.apply(me || window, args) :                            null;                };    },    //创建回调函数    /*    var sayHi = function(name){       alert('Hi, ' + name);    }    sayHi.createCallback('Fred')    */    createCallback : function(/*args...*/){        // make args available, in function below        var args = arguments,            method = this;        return function() {            return method.apply(window, args);        };    },    //委派    createDelegate : function(obj, args, appendArgs){        var method = this;        return function() {            var callArgs = args || arguments;            if (appendArgs === true){                callArgs = Array.prototype.slice.call(arguments, 0);                callArgs = callArgs.concat(args);            }else if (Ext.isNumber(appendArgs)){                callArgs = Array.prototype.slice.call(arguments, 0); // copy arguments first                var applyArgs = [appendArgs, 0].concat(args); // create method call params                Array.prototype.splice.apply(callArgs, applyArgs); // splice them in            }            return method.apply(obj || window, callArgs);        };    },    //延迟执行    /*    var sayHi = function(name){     alert('Hi, ' + name);   }   sayHi.defer(2000, this, ['Fred']);    */    //millis毫秒数,args调用函数的参数，appendArgs附加参数    defer : function(millis, obj, args, appendArgs){        var fn = this.createDelegate(obj, args, appendArgs);        if(millis > 0){            return setTimeout(fn, millis);        }        fn();        return 0;    },    //创建队列函数,    createSequence : function(fcn, scope){        var method = this;        return !Ext.isFunction(fcn) ?                this :                function(){                    var retval = method.apply(this || window, arguments);                    fcn.apply(scope || this || window, arguments);                    return retval;                };    }})