在chrome下测试不行...不过这个代码的原理到底是啥... TypeError: Array.prototype.sort called on null or undefined arguments: Array[1] get message: function getter() { [native code] } get stack: function getter() { [native code] } set message: function setter() { [native code] } set stack: function setter() { [native code] } type: "called_on_null_or_undefined" __proto__: Error