substring 是用于截取字符串的方法，需指定起始和结束索引两个参数，提取位于这两个位置之间的子字符串。 1、 新建一个名为substring的HTML文件。

substring 是用于截取字符串的方法，需指定起始和结束索引两个参数，提取位于这两个位置之间的子字符串。 1、 新建一个名为substring的HTML文件。 4、 使用substring方法提取从第3到第10个字符之间的子字符串。

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