非常蛋疼的JavaScript试题
JavaScript有很多地方和我们熟知的C、Java等的编程习惯不同，这些不同会产生很多让人意想不到的事情。前段时间在知乎有人发了写Javascrtip试题，觉得挺好玩的，这里跟大家分享一下。01view sourceprint?1 (function () { 2 return typeof arguments; 3 })(); 4 5 A. "object" 6 B. "array" 7 C. "arguments" 8 D. "undefined" 答案：A02view sourceprint?1 var f = function g() {2 return 23;3 };4 typeof g();5 6 A. "number" 7 B. "undefined" 8 C. "function" 9 D. Eorror 答案：D03view sourceprint?1 (function (x) {2 delete x;3 return x;4 })(1);5 6 A. 17 B. null8 C. undefined9 D. Error 答案：A04view sourceprint?1 var y = 1,2 x = y = typeof x;3 x;4 5 A. 16 B. "number" 7 C. undefined8 D. "undefined" 答案： D05view sourceprint?01 (function f(f) {02 return typeof f();03 })(function () {04 return 1;05 });06 07 A. "number" 08 B. "undefined" 09 C. "function" 10 D. Error 答案：A06view sourceprint?01 var foo = {02 bar: function () {03 return this.baz;04 },05 baz: 106 };07 (function () {08 return typeof arguments();09 })(foo.bar);10 11 A. "undefined" 12 B. "object" 13 C. "number" 14 D. "function" 答案：A07view sourceprint?01 var foo = {02 bar: function () {03 return this.baz;04 },05 baz: 106 };07 typeof (f = foo.bar)();08 09 A. "undefined" 10 B. "object" 11 C. "number" 12 D. "function" 答案：A08view sourceprint?01 var f = (function f() {02 return "1";03 }, function g() {04 return 2;05 })();06 typeof f;07 08 A. "string" 09 B. "number" 10 C. "function" 11 D. "undefined" 答案： B09view sourceprint?01 var x = 1;02 if (function f() {}) {03 x += typeof f;04 }05 x;06 07 A. 108 B. "1function" 09 C. "1undefined" 10 D. NaN 答案： C10view sourceprint?1 var x = ;2 typeof typeof x;3 4 A. "number" 5 B. "string" 6 C. "undefined" 7 D. "object" 答案： B11view sourceprint?01 (function (foo) {02 return typeof foo.bar;03 })({04 foo: {05 bar: 106 }07 });08 09 A、“undefined” 10 B、“object” 11 C、“number” 12 D、Error 答案： A12view sourceprint?01 (function f() {02 function f() {03 return 1;04 }05 return f();06 07 function f() {08 return 2;09 }10 })();11 12 A、1 13 B、2 14 C、Error (e.g. “Too much recursion”) 15 D、undefined 答案：B13view sourceprint?1 function f() {2 return f;3 }4 new f() instanceof f;5 6 A、true 7 B、false 答案：B14view sourceprint?1 with (function(x, undefined){}) length;2 3 A、1 4 B、2 5 C、undefined 6 D、Error 答案：B具体答案大家可以自己运行得出，为什么会得出这样的结果，我也有一些不懂的地方，怕误人子弟，所以这里就不解答这里的问题了。
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