ES5的话也可以使用forEach，ES5具有遍历数组功能的还有map、filter、some、every、reduce、reduceRight等，只不过他们的返回结果不一样。但是使用foreach遍历数组的话，使用break不能中断循环，使用return也不能返回到外层函数。 3.使用for in会遍历数组所有的可枚举属性 ...

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Microsoft has followed up its Python for beginners tutorials on YouTube with a new series aimed at teaching novice programmers the widely used JavaScript programming ...