Javascript JS 中 == 和 === 的区别
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Difference between == and === in JS
提问by jslearner
Possible Duplicates:
Difference between == and === in JavaScript
Javascript === vs == : Does it matter which “equal” operator I use?
可能的重复：
JavaScript 中 == 和 === 之间的区别
Javascript === vs == ：我使用哪个“相等”运算符重要吗？
What's the difference between ==and ===? Also between !==and !==?
==和 和有===什么区别？也介于!==和之间!==？
回答by jAndy
There are lots of answers to this question on Stackoverflow already.
这个问题在 Stackoverflow 上已经有很多答案了。
Short:
短的：
==only compares values
==只比较值
===compares values + type
===比较值 + 类型
var check1 = '10',
check2 = 10;
check1 == check2 // true
check1 === check2 // false
回答by Rob Levine
"==" means equals, whereas "===" means identically equal.
“==”表示相等，而“===”表示完全相等。
In short, "==" will try and coerce/convert the types of values when doing a comparison, so "2"==2, whereas "===" will not.
简而言之，“==”将在进行比较时尝试强制/转换值的类型，因此“2”==2，而“===”则不会。
