Function函数分析

Ext.Function = {
    flexSetter:function(fn){},
    bind:function(fn, scope, args, appendArgs){},
    pass:function(fn, args, scope){},
    alias:function(object, methodName){},
    clone: function(method) {}.
    createInterceptor: function(origFn, newFn, scope, returnValue) {},
    createDelayed: function(fn, delay, scope, args, appendArgs) {},
defer: function(fn, millis, scope, args, appendArgs) {},
createSequence: function(originalFn, newFn, scope) {},
createBuffered: function(fn, buffer, scope, args) {},
createThrottled: function(fn, interval, scope) {},
interceptBefore: function(object, methodName, fn, scope) {}
interceptAfter: function(object, methodName, fn, scope) {}
}

一共13个函数
flexSetter(fn) : 对当前对象调用fn(a,b), 如果a等于null，直接返回当前对象，
                 如果a是数组和对象，此时b无意义，迭代a里面的键值对为a和b，传到fn里，
             for (k in a) {
                    if (a.hasOwnProperty(k)) {
                        fn.call(this, k, a[k]);
                    }
                }
                 如果a是字符串，直接调用fn     fn.call(this, a, b);