javascript - 没有严格的比较，哪些值将被评估为真和假？

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我想拥有所有值的列表，这些值将通过相等性检查如true，false甚至!=评估为==或if()

我有一份过去几年收集的清单，但由于我的电脑而死了

最佳答案

http://bonsaiden.github.com/JavaScript-Garden/#types.equality

“最好学习强制性规则，而不是试图记住上帝知道多少不同比较结果”。

...但是这是清单;）

==

""           ==   "0"           // false
0            ==   ""            // true
0            ==   "0"           // true
false        ==   "false"       // false
false        ==   "0"           // true
false        ==   undefined     // false
false        ==   null          // false
null         ==   undefined     // true
" \t\r\n"    ==   0             // true

===

""           ===   "0"           // false
0            ===   ""            // false
0            ===   "0"           // false
false        ===   "false"       // false
false        ===   "0"           // false
false        ===   undefined     // false
false        ===   null          // false
null         ===   undefined     // false
" \t\r\n"    ===   0             // false

对象

{}                 === {};       // false
new String('foo')  === 'foo';    // false
new Number(10)     === 10;       // false

var foo = {};
foo                === foo;      // true

NaN                ==   NaN      // false
NaN                ===  NaN      // false
NaN                ==   false    // false

//NaN does not coerce using non-strict equality.

更新29/01/14：

为完整起见添加了NaN。

关于javascript - 没有严格的比较，哪些值将被评估为真和假？ ，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/9417201/