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我要爆仓ECMAScript v3 规定，replace() 方法的参数 replacement 可以是函数而不是字符串。在这种情况下，每个匹配都调用该函数，它返回的字符串将作为替换文本使用。该函数的第一个参数是匹配模式的字符串。接下来的参数是与模式中的子表达式匹配的字符串，可以有 0 个或多个这样的参数。接下来的参数是一个整数，声明了匹配在 stringObject 中出现的位置。最后一个参数是 stringObject 本身。
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