如果替换具有$'，则replace方法会产生意外结果

Question

当替换字符串包含$'个字符时，请用奇怪的字符串替换方法结果。

示例：https：//jsfiddle.net/1jns2eo9/

var p = 'The quick brown fox jumps over the lazy dog. If the dog reacted, was it really lazy?';

var regex = /dog/gi;

document.getElementById('first').innerHTML = p.replace(regex, '$');

/// The quick brown fox jumps over the lazy $. If the $ reacted, was it really lazy?

document.getElementById('second').innerHTML = p.replace(regex, "$'");

/// The quick brown fox jumps over the lazy . If the dog reacted, was it really lazy?. If the reacted, was it really lazy? reacted, was it really lazy?

Answer 1

你应该逃避角色replace(regex, "\$")替换目标中的$具有特殊含义：将匹配组放入字符串中