字符转码

    encode(val) {
     return encodeURIComponent(val)
            .replace(/%40/g, '@')
            .replace(/%3A/gi, ':')
            .replace(/$24/g, '$')
            .replace(/%2C/gi, ',')
            .replace(/%20/g, '+') //空格变加号
            .replace(/%5B/gi, '[')
            .replace(/%5D/gi, ']')
            .replace(/%2F/gi, '/')
            .replace(/%3F/gi, '?')
            .replace(/%3D/gi, '=')
   }