What about == and === in javascript?
Possible Duplicate:
JavaScript === vs == : Does it matter which “equal” operator I use?
Difference between == and === in JavaScript
As we all know you can do either (value==other_value) or (value===other_value) to compare the two values, where === is the strict version of == .
But what is the real difference? Like what's so much better about === , respectively what advantages does == give you? Same for != and !== ?
The comparison is type-wise. '1' == 1 is true. However, '1' === 1 is false. If you don't know what type-wise comparison will bring you, go learn more about programming and your language.
In a nutshell, the == will perform type conversion and === will not. That conversion is expansive.
请阅读：JavaScript和==和===之间的区别
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