javascript - JavaScript中==和===之间的区别[重复](Difference between == and === in JavaScript [duplicate])

Question

This question already has an answer here:(这个问题已经在这里有了答案：)

• Which equals operator (== vs ===) should be used in JavaScript comparisons?(JavaScript比较中应使用哪个等于运算符（== vs ===）？) 49 answers(49个答案)

What is the difference between == and === in JavaScript?(JavaScript中==和===什么区别？)

I have also seen != and !== operators.(我也看到过!=和!==运算符。) Are there more such operators?(还有更多这样的运营商吗？)   ask by Shiva translate from so

Answer 1

Take a look here: http://longgoldenears.blogspot.com/2007/09/triple-equals-in-javascript.html(在这里看看： http : //longgoldenears.blogspot.com/2007/09/triple-equals-in-javascript.html)

The 3 equal signs mean "equality without type coercion".(3个等号表示“没有类型强制的平等”。)

Using the triple equals, the values must be equal in type as well.(使用三重等于，值的类型也必须相等。)

0 == false   // true
0 === false  // false, because they are of a different type
1 == "1"     // true, automatic type conversion for value only
1 === "1"    // false, because they are of a different type
null == undefined // true
null === undefined // false
'0' == false // true
'0' === false // false