常用JS工具方法

常用JS工具方法，可以直接在JS开发中拿来就用。so easy.

• 日期时间显示格式化
• 获取页面链接参数
• 文件大小显示格式化
• 获取指定的时间间隔

日期时间显示格式化

//common.js

//日期时间显示 格式化 例:2016-12-12 12:12:12
let datetimeFormat = function(data, fmt){
    if(!data){
        return '';
    }else{
        var dateData = new Date(data);
        var o = {
            "Y+" : dateData.getFullYear(),                //年份
            "M+" : dateData.getMonth()+1,                 //月份
            "d+" : dateData.getDate(),                    //日
            "h+" : dateData.getHours(),                   //小时
            "m+" : dateData.getMinutes(),                 //分
            "s+" : dateData.getSeconds(),                 //秒
            "q+" : Math.floor((dateData.getMonth()+3)/3), //季度
            "S"  : dateData.getMilliseconds()             //毫秒
        };
        if(/(y+)/.test(fmt)){
            fmt=fmt.replace(RegExp.$1, (dateData.getFullYear()+"").substr(4 - RegExp.$1.length));
        }
        for(var k in o){
            if(new RegExp("("+ k +")").test(fmt)){
                fmt = fmt.replace(RegExp.$1, (RegExp.$1.length==1) ? (o[k]) : (("00"+ o[k]).substr((""+ o[k]).length)));
            }
        }
        return fmt;
    }
};

module.exports = {
    datetimeFormat
}

//使用
import { datetimeFormat } from 'common';

createTime = datetimeFormat(createTime, "Y-MM-dd hh:mm:ss");

获取页面链接参数

//common.js

let getUrlParam = function(name) {
    let str = window.location.href;
    let num = str.indexOf("?") 
     str = str.substr(num+1);

    let arr = str.split("&"), params = {}; //各个参数放到数组里
     for(let i=0; i<arr.length; i++){ 
      num = arr[i].indexOf("="); 
      if(num>0){
          let key = arr[i].substring(0,num);
          let value = arr[i].substr(num+1);
          params[key] = value;
      } 
    }

    if(params[name]){
      return params[name];
    }else{
      return null;
    }
}

module.exports = {
    getUrlParam
}

//使用
import { getUrlParam } from 'common';

getUrlParam('id')

文件大小显示格式化

//common.js

//文件大小显示 格式化 例:10KB，200MB，1020GB
let fileSizeFormat = function(fileSize){
    let formatFileSize = '0B';
    if(fileSize){
        if(fileSize<1024){ formatfilesize="fileSize+'B';" }else{="" let="" ksize="fileSize/1024;" if(ksize<1024){="" 'kb';="" msize="kSize/1024;" if(msize<1024){="" 'mb';="" gsize="mSize/1024;" if(gsize<1024){="" 'gb';="" tsize="gSize/1024;" if(tsize<1024){="" 'tb';="" }="" return="" formatfilesize;="" };="" module.exports="{" filesizeformat="" 使用="" import="" {="" from="" 'common';="" filesizeformat(filesize)="" <="" code="">

获取指定的时间间隔

//common.js

import moment from 'moment';

let fixedZero = function(val) {
    return val * 1 < 10 ? `0${val}` : val;
}

let getTimeDistance = function(type) {
    const now = new Date();
    const oneDay = 1000 * 60 * 60 * 24;

    if (type === 'today') {
      now.setHours(0);
      now.setMinutes(0);
      now.setSeconds(0);
      return [moment(now), moment(now.getTime() + (oneDay - 1000))];
    }

    if (type === 'week') {
      let day = now.getDay();
      now.setHours(0);
      now.setMinutes(0);
      now.setSeconds(0);

      if (day === 0) {
        day = 6;
      } else {
        day -= 1;
      }

      const beginTime = now.getTime() - (day * oneDay);

      return [moment(beginTime), moment(beginTime + ((7 * oneDay) - 1000))];
    }

    if (type === 'month') {
      const year = now.getFullYear();
      const month = now.getMonth();
      const nextDate = moment(now).add(1, 'months');
      const nextYear = nextDate.year();
      const nextMonth = nextDate.month();

      return [moment(`${year}-${fixedZero(month + 1)}-01 00:00:00`), moment(moment(`${nextYear}-${fixedZero(nextMonth + 1)}-01 00:00:00`).valueOf() - 1000)];
    }

    if (type === 'year') {
      const year = now.getFullYear();

      return [moment(`${year}-01-01 00:00:00`), moment(`${year}-12-31 23:59:59`)];
    }
}

module.exports = {
    getTimeDistance
}

//使用
import { getTimeDistance } from 'common';

getTimeDistance('week');