总结的一些函数

1.一位数组切割成二维数组

hdandle: function(lists,pageSize){
        var newLists = [];
        var temLists = [];
        if (lists.length > 0) {
            for (var i = 0, lth = lists.length; i < lth; i++) {
                lists[i].index = i;
                temLists.push(lists[i]);
                if ((i + 1) % pageSize === 0 || (i === lth - 1 && (i + 1) % pageSize !== 0)) {
                    newLists.push(temLists);
                    temLists = [];
                }
            }
        };
        return newLists;
    }

2.判断链接是否为图片

function isImg(str){
    var patt = /[.png|.jpg|.jpeg|.gif|.bmp|.webp|.ico|.svg]$/i;
     return patt.test( str.replace(/\s*/g,"") );
};

3.无线和pc的判断

function(){
   var sUserAgent = navigator.userAgent.toLowerCase();
          var bIsIpad = sUserAgent.match(/ipad/i) == "ipad";
          var bIsIphoneOs = sUserAgent.match(/iphone os/i) == "iphone os";
          var bIsMidp = sUserAgent.match(/midp/i) == "midp";
          var bIsUc7 = sUserAgent.match(/rv:1.2.3.4/i) == "rv:1.2.3.4";
          var bIsUc = sUserAgent.match(/ucweb/i) == "ucweb";
          var bIsAndroid = sUserAgent.match(/android/i) == "android";
          var bIsCE = sUserAgent.match(/windows ce/i) == "windows ce";
          var bIsWM = sUserAgent.match(/windows mobile/i) == "windows mobile";
          if (!(bIsIpad || bIsIphoneOs || bIsMidp || bIsUc7 || bIsUc || bIsAndroid || bIsCE || bIsWM) ){
          //pc页面
          
          }else {
            //无线页面
            window.location.href="https://peixun.1688.com/cms/yysbfwx.html";
          }  
}

 4.根据时间戳返回刚刚，几分钟前，几小时前，几天前，几个月前（超过3个月显示时间）

timeago(dateTimeStamp) { // dateTimeStamp是一个时间毫秒，注意时间戳是秒的形式，在这个毫秒的基础上除以1000，就是十位数的时间戳。13位数的都是时间毫秒。
let minute = 1000 * 60; // 把分，时，天，周，半个月，一个月用毫秒表示
let hour = minute * 60;
let day = hour * 24;
let week = day * 7;
// let halfamonth = day * 15;
let month = day * 30;
let now = new Date().getTime(); // 获取当前时间毫秒
console.log(now);
let diffValue = now - dateTimeStamp;// 时间差

if (diffValue < 0) {
return;
}
let result = '';
let minC = diffValue / minute; // 计算时间差的分，时，天，周，月
let hourC = diffValue / hour;
let dayC = diffValue / day;
let weekC = diffValue / week;
let monthC = diffValue / month;
if (monthC >= 1 && monthC <= 3) {
result = ' ' + parseInt(monthC) + '月前';
} else if (weekC >= 1 && weekC <= 3) {
result = ' ' + parseInt(weekC) + '周前';
} else if (dayC >= 1 && dayC <= 6) {
result = ' ' + parseInt(dayC) + '天前';
} else if (hourC >= 1 && hourC <= 23) {
result = ' ' + parseInt(hourC) + '小时前';
} else if (minC >= 1 && minC <= 59) {
result = ' ' + parseInt(minC) + '分钟前';
} else if (diffValue >= 0 && diffValue <= minute) {
result = '刚刚';
} else {
let datetime = new Date();
datetime.setTime(dateTimeStamp);
let Nyear = datetime.getFullYear();
let Nmonth = datetime.getMonth() + 1 < 10 ? '0' + (datetime.getMonth() + 1) : datetime.getMonth() + 1;
let Ndate = datetime.getDate() < 10 ? '0' + datetime.getDate() : datetime.getDate();
// let Nhour = datetime.getHours() < 10 ? "0" + datetime.getHours() : datetime.getHours();
// let Nminute = datetime.getMinutes() < 10 ? "0" + datetime.getMinutes() : datetime.getMinutes();
// let Nsecond = datetime.getSeconds() < 10 ? "0" + datetime.getSeconds() : datetime.getSeconds();
result = Nyear + '-' + Nmonth + '-' + Ndate;
}
return result;
}