update:ES6之数组和对象的扩展
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@@ -157,6 +157,7 @@ sqrt即“square 开方”。比如:
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```
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console.log("6" == 6); //true
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console.log(0 == -0); //true
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```
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如果要保证**完全等于**,我们就要用三个等号`===`。例如:
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