fix typos
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@@ -480,7 +480,7 @@ PS:这几个方法**不会修改原数组**。
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var array = [1,2,3,4,5,6];
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array.splice(0); //方式1:删除数组中所有项目
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array.length = 0; //方式1:length属性可以赋值,在其它语言中length是只读
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array.length = 0; //方式2:length属性可以赋值,在其它语言中length是只读
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array = []; //方式3:推荐
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```
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