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; }; }})