let str = "0123";  //要替换的字串
        let letter= "ABCD"; //目的字符表
        let num= "0123";      //原始字符表
        for (let i = 0; i < letter.length; i++) {
          str = eval("str.replace(/" + num.substr(i, 1) + "/g,'" + letter.substr(i, 1) + "')");
        }
        console.log(str);