替换单个字符串：

1 var str="Visit Microsoft!"
2 console.log(str.replace(/Microsoft/,"W3School"));

替换多个字符串：

1 var str="Welcome to Microsoft! ";
2 str=str + "We are proud to announce that Microsoft has ";
3 str=str + "one of the largest Web Developers sites in the world.";
4 console.log(str.replace(/Microsoft/g, "W3School"))

替换转义字符：

1 var str="Welcome to "Microsoft"! ";
2 str=str + "We are proud to announce that "Microsoft" has ";
3 str=str + "one of the largest Web Developers sites in the world.";
4 console.log(str.replace(/Microsoft/g, "W3School"))
5 console.log(str.replace(new RegExp('"',"gm"),'"'))

参考地址：

https://www.w3school.com.cn/jsref/jsref_replace.asp