js更改字符串的颜色

      brighten(res, text) { // 处理关键字变色
        if (text.length > 0) {
          let txt = res
          for (let i = 0; i < text.length; i++) {
            let replaceReg = new RegExp(text[i], 'g')
            let replaceString = '' + text[i] + ''
            txt = txt.replace(replaceReg, replaceString)
          }
          console.log(txt)
          return txt
        } else {
          return res
        }

      },
// 使用