javascript 为什么 3 等于 AngularJS ？有什么具体原因吗？
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why 3 equals in AngularJS ? Is there any specific reason?
提问by DeepInJava
I have seen many places where angular js uses triple equals sign ===to compare two elements why not 2 equals
==. I am just wondering is there any specific reason for that ?
我在很多地方看到 angular js 使用三重等号===来比较两个元素，为什么不是 2 equals ==。我只是想知道是否有任何具体原因？
回答by Barry
The ===operator checks value and type while the ==operator only checks value, simple example
的===操作者检查值和类型而==操作者只检查值，简单的例子
1 == "1" -> true
1 === "1" -> false (types are not equal)
Sometimes you want to use this strict comparison, especially when checking a boolean value.
有时您想使用这种严格的比较，尤其是在检查布尔值时。
1 == true -> true
1 === true -> false (types are not equal)
