Javascript replace “\” to “\” : 자바스크립트 “\” 를  “\”로 변환 

If you need to replace all of the occurrences of two backslashes in a row into a single backslash, you use a regular expression with the g flag. Because backslashes are special in regular expressions, you have to escape them (with another backslash). You also have to use the return value of replace:

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var str = "Here: \\ and here \\";
console.log(str);
str = str.replace(/\\/g, "\");
console.log(str);