讓人蛋疼的JavaScript語法特性
在知乎上看到的有人發(fā)布的和javascript有關(guān)的試題，和大家分享下，雖然是N久前的事了，但這些題相當(dāng)經(jīng)典，不免讓人覺得javascript真是門蛋疼的語言。
1.
(function () {
return typeof arguments;
})();
A. "object"
B. "array"
C. "arguments"
D. "undefined"
答案：A
2.
var f = function g() {
return 23;
};
typeof g();
A. "number"
B. "undefined"
C. "function"
D. Eorror
答案：D
3.
(function (x) {
delete x;
return x;
})(1);
A. 1
B. null
C. undefined
D. Error
答案：A
4.
var y = 1,
x = y = typeof x;
x;
A. 1
B. "number"
C. undefined
D. "undefined"
答案：D
5.
(function f(f) {
return typeof f();
})(function () {
return 1;
});
A. "number"
B. "undefined"
C. "function"
D. Error
答案：A
6.
var foo = {
bar: function () {
return this.baz;
},
baz: 1
};
(function () {
return typeof arguments[0]();
})(foo.bar);
A. "undefined"
B. "object"
C. "number"
D. "function"
答案：A
7.
var foo = {
bar: function () {
return this.baz;
},
baz: 1
};
typeof (f = foo.bar)();
A. "undefined"
B. "object"
C. "number"
D. "function"
答案：A
8.
var f = (function f() {
return "1";
}, function g() {
return 2;
})();
typeof f;
A. "string"
B. "number"
C. "function"
D. "undefined"
答案：B
9.
var x = 1;
if (function f() {}) {
x += typeof f;
}
x;
A. 1
B. "1function"
C. "1undefined"
D. NaN
答案：C
10.
var x = [typeof x, typeof y][1];
typeof typeof x;
A. "number"
B. "string"
C. "undefined"
D. "object"
答案：B
11.
(function (foo) {
return typeof foo.bar;
})({
foo: {
bar: 1
}
});
A、“undefined”
B、“object”
C、“number”
D、Error
答案：A
12.
(function f() {
function f() {
return 1;
}
return f();
function f() {
return 2;
}
})();
A、1
B、2
C、Error (e.g. “Too much recursion”)
D、undefined
答案：B
13.
function f() {
return f;
}
new f() instanceof f;
A、true
B、false
答案：B
14.
with (function(x, undefined){}) length;
A、1
B、2
C、undefined
D、Error
答案：B
15.
以下哪條語句會產(chǎn)生運行錯誤:（）
A.var obj = ();
B.var obj = [];
C.var obj = {};
D.var obj = //;
答案：A
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