substring() returns a portion of a string and it’s similar to , with some key differences.

substring()返回字符串的一部分，它类似于 ，但有一些关键区别。

If any parameter is negative, it is converted to 0. If any parameter is higher than the string length, it is converted to the length of the string.

如果任何参数为负，则将其转换为0 。 如果任何参数大于字符串长度，则将其转换为字符串的长度。

So:

所以：

'This is my car'.substring(5) //'is my car''This is my car'.substring(5, 10) //'is my''This is my car'.substring(5, 200) //'is my car''This is my car'.substring(-6) //'This is my car''This is my car'.substring(-6, 2) //'Th''This is my car'.substring(-6, 200) //'This is my car'

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