var myarray; (function () {     var astr = "[object Array]",         toString = Object.prototype.toString;     function isArray(a) {         return toString.call(a) === astr;     }     function indexOf(haystack, needle) {         var i = 0,             max = haystack.length;         for (; i < max; i += 1) {             if (haystack[i] === needle) {                 return i;             }         }         return -1;     }     //通过赋值的方式，将上面所有的细节都隐藏了     myarray = {         isArray: isArray,         indexOf: indexOf,         inArray: indexOf     }; } ()); //测试代码 console.log(myarray.isArray([1, 2])); // true console.log(myarray.isArray({ 0: 1 })); // false console.log(myarray.indexOf(["a", "b", "z"], "z")); // 2 console.log(myarray.inArray(["a", "b", "z"], "z")); // 2 myarray.indexOf = null; console.log(myarray.inArray(["a", "b", "z"], "z")); // 2

var obj = {     value: 1,     increment: function () {         this.value += 1;         return this;     },     add: function (v) {         this.value += v;         return this;     },     shout: function () {         console.log(this.value);     } }; // 链方法调用 obj.increment().add(3).shout(); // 5 // 也可以单独一个一个调用 obj.increment(); obj.add(3); obj.shout();