常用的N个JS函数

部分来源于网络，此为归纳总结。

一、GMT时间格式转换为YYYY-MM-DD

formatGMT(time){
    let dateData =newDate(Date.parse(time));
    let datetime =newDate();
    datetime.setTime(dateData);
    let year = datetime.getFullYear();
    let month = datetime.getMonth() +1<10?"0"+ (datetime.getMonth() +1) : datetime.getMonth() +1;
    let date = datetime.getDate() <10?"0"+ datetime.getDate() : datetime.getDate();
    return year+"-"+month+"-"+date;
}

返回值可以自己设置要转换的格式

二、相对严格的身份证格式验证

IdentityCodeValid(code) {
    let city = {11:"北京",12:"天津",13:"河北",14:"山西",15:"内蒙古",21:"辽宁",22:"吉林",23:"黑龙江 ",31:"上海",32:"江苏",33:"浙江",34:"安徽",35:"福建",36:"江西",37:"山东",41:"河南",42:"湖北 ",43:"湖南",44:"广东",45:"广西",46:"海南",50:"重庆",51:"四川",52:"贵州",53:"云南",54:"西藏 ",61:"陕西",62:"甘肃",63:"青海",64:"宁夏",65:"新疆",71:"台湾",81:"香港",82:"澳门",91:"国外 "};
    let tip = "";
    let pass= true;
    if(!code || !/^\d{6}(18|19|20)?\d{2}(0[1-9]|1[012])(0[1-9]|[12]\d|3[01])\d{3}(\d|X)$/i.test(code)){
        tip = "身份证号格式错误";
        pass = false;
    }else{
        //18位身份证需要验证最后一位校验位
         if(code.length == 18){
            code = code.split('');
            //∑(ai×Wi)(mod 11)
            //加权因子
            let factor = [ 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 ];
            //校验位
            let parity = [ 1, 0, 'X', 9, 8, 7, 6, 5, 4, 3, 2 ];
            let sum = 0;
            let ai = 0;
            let wi = 0;
            for (let i = 0; i < 17; i++){
                ai = code[i];
                wi = factor[i];
                sum += ai * wi;
            }
            let last = parity[sum % 11];
            if(parity[sum % 11] != code[17]){
                tip = "最后一位校验位错误";
                pass =false;
             }
        }
     }
     let validInfo = {
         pass: pass,
         tip: tip
     }
     return validInfo;
}

如果验证不严格可以不检查最后一位校验位。

三、post请求的通用参数转换

transformParams(data) {
  let ret = '';
  for (let it in data) {
    ret += encodeURIComponent(it) + '=' + encodeURIComponent(data[it]) + '&';
  }
  ret = ret.substring(0, ret.length - 1);
  return ret;
}

如上。

四、get请求的通用参数转换

transformQuery(data) {
  let toData = "";
  if (data !== null) {
    toData = "?";
    for (const key in data) {
      toData += `${key}=${data[key]}&`;
    }
  }
  return toData;
}

如上。

五、时间戳转换

formatDate(timestamp) {
    let date = new Date(timestamp);
    return date.getYear() + "-" + date.getMonth() + 1 + "-" + date.getDate() + "   " + date.getHours() + ":" + date.getMinutes() + ":" + date.getSeconds();
  }