Javascript 专业四级：这几个问题，你会做几个？

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Javascript 权威指南第 5 版

Closure: The Definitive Guide

这是一个创建于 3784 天前的主题，其中的信息可能已经有所发展或是发生改变。

1. "1" - - "1";
2. new Array(5).toString();
3.
var x = 0;
function foo() {
x++;
this.x = x;
return foo;
}
var bar = new new foo;
console.log(bar.x);
4.
var bar = 1,
foo = {};

foo: {
bar: 2;
baz: ++bar;
};
foo.baz + foo.bar + bar;
5.
function foo(a, b) {
arguments[1] = 2;
console.log(b);
}
foo(1);
6. (true + false) > 2 + true;

foo

var

function

17 条回复 2015-07-12 20:34:48 +08:00

zhujinliang

2015-07-01 16:31:00 +08:00

chrome console加google终于弄明白了。。。感谢楼主分享

hahasong

2015-07-01 16:34:47 +08:00

反对任何滥用语言的灵活性，生产环境写这种东西真的是作死

101

2015-07-01 16:36:10 +08:00

第六题还能这么玩......

mhycy

2015-07-01 16:41:42 +08:00

这种应试题有什么意义么？

shreksu

2015-07-01 16:47:11 +08:00

然并卵

latelx

2015-07-01 16:47:54 +08:00

格式太差。。。。

datou552211

2015-07-01 16:59:38 +08:00 via iPhone

会写二叉树嘛

snailsir

2015-07-01 17:01:14 +08:00

有没有专业六级的

newghost

2015-07-01 17:13:24 +08:00

@snailsir

专业八级

http://ourjs.com/detail/52fb82e13bd19c4814000001

snailsir

2015-07-01 18:52:15 +08:00

@newghost 跪了

bramblex

2015-07-01 20:26:40 +08:00

楼主把下面这段Javascript代码解释一遍再说吧：

[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]][([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]((![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]+(!![]+[])[+[]]+(![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[!+[]+!+[]+[+[]]]+[+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[!+[]+!+[]+[+[]]])()