工作中常用的一些基础方法，记录下

1.获取非行间元素的样式

 function getstyle（Obj，name）{
        
    if（Obj.currentStyle）{
            //ie
        return Obj.currentStyle[name];
}
    else{
         //FF Chrome
         return getCompunedStyle(Obj,false)[name];
}    
 }

 调用方式：getstyle（obj，name）

obj：需要获取的元素对象

name：需要获取的样式名

2.数组排序（升序）

  var array=[11,22,8,45,89,12]
 array.sort(function(n1,n2){
    return n1-n2
})
alert(array)

3.zepto封装的滑动方法

  handleScrollTo : function () {
        $.fn.scrollTo =function(options){
            var defaults = {
                toT : 0,    //滚动目标位置
                durTime : 400,  //过渡动画时间
                delay : 20,     //定时器时间
                callback:null   //回调函数
            };
            var opts = $.extend(defaults,options),
                timer = null,_this = this,
                curTop = _this.scrollTop(),//滚动条当前的位置
                subTop = opts.toT - curTop,    //滚动条目标位置和当前位置的差值
                index = 0,dur = Math.round(opts.durTime / opts.delay),
                per = Math.round(subTop/dur),
                smoothScroll = function(t){
                    index++;
                    if(index >= dur){
                        _this.scrollTop(t);
                        window.clearInterval(timer);
                        if(!publicFun.isNull(opts.callback) && typeof opts.callback == 'function') opts.callback();
                    }else{
                        _this.scrollTop(curTop + index*per);
                    }
                };
            timer = window.setInterval(function(){
                smoothScroll(opts.toT);
            }, opts.delay);
            return _this;
        };
    },

 例 ：回到顶部

handleScrollTo（）

$("body").scrollTo( {toT : 0} );

  

4.数组的随机排序

    var array=[1,22,3,,14,52,8]
function shuffle(arr) {
   arr.sort(function () {
      return Math.random() - 0.5;
   });
}
shuffle(array)
console.log(array)

5.预加载（附Html及js）

html：<div class="loading">
    <div class="page">
        <div class="h832" style="padding-top: 0px;">
            <div class="innerDiv">
                <div class="line_c">
                    <div class="line"></div>
                </div>
                <p>0% loading...</p>
            </div>
        </div>
    </div>
</div>




var speed=0;
    function preloadimages(arr){
        var newimages=[], loadedimages=0;
        var arr=(typeof arr!="object")? [arr] : arr;
        function imageloadpost(){
            loadedimages++;
            speed=parseInt(loadedimages/arr.length*100);
            $('.loading p').text(speed+'% loading...');
            $('.line_c .line').css('left',-(100-speed)+'%');
            if (loadedimages==arr.length){
                $('.loading').hide();
                // $('.swiper-wrapper1').show();

            }
        }
        for (var i=0; i<arr.length; i++){
            newimages[i]=new Image();
            newimages[i].src=arr[i];
            newimages[i].onload=function(){
                imageloadpost();
            }
            newimages[i].onerror=function(){
                imageloadpost()
            }
        }
    }
    var imagesarray=[需要加载的数据资源];
    preloadimages(imagesarray);

6.数组去重

function removeDuplicatedItem(arr) {
    var ret = [];

    for (var i = 0,i< arr.length;  i++) {
        if (ret.indexOf(arr[i]) === -1) {
            ret.push(arr[i]);
        }
    }

    return ret;
}

7.获取指定范围内的随机数

var getRandom = function(max, min) {
    min = arguments[1] || 0;
    return Math.floor(Math.random() * (max - min + 1) + min);
};

8.数组去除重复字符

function arry(myArray){
        var haha=myArray;
        for(var i=0;i<myArray.length;i++)
        {
            for(var j=0;j<myArray.length;j++)
            {
                temp=myArray[i];
                if((i+j+1)<myArray.length&&temp==myArray[i+j+1]) //如果当前元素与后一个元素相等
                    haha.splice(i+j+1,1); //然后就移除下一个元素
            }
        }
        return haha;
    }

9.短信发送60秒倒计时

//settime($("#getPhoneCode"),60);

function settime($obj, time) {
    if (time == 0) {
        $obj.attr("disabled", false);
        $obj.css("background", "#f38401").css("cursor", "pointer");
        $obj.text("获取手机验证码"); 
        return;
    } else {
        $obj.attr("disabled", true);
        $obj.css("background", "#ccc").css("cursor", "not-allowed");
        $obj.text("重新发送(" + time + ")");
        time--;
    }
    setTimeout(function () { settime($obj, time) }, 1000)
}

10.去除数组中的最大值和最小值

var numbers = [5, 458 , 120 , -215 , 228 , 400 , 122205, -85411]; 
var maxInNumbers = Math.max.apply(Math, numbers); 
var minInNumbers = Math.min.apply(Math, numbers);

11.数组中找一个数

function find (x, y) {
  for ( let i = 0; i < x.length; i++ ) {
    if ( x[i] == y ) return i;
  }
  return null;
}

let arr = [0,1,2,3,4,5]
console.log(find(arr, 2))
console.log(find(arr, 8))

12.获取随机数的函数方法

     var rand = (function() {
            var today = new Date();
            var seed = today.getTime();

            function rnd() {
                seed = (seed * 9301 + 49297) % 233280;
                return seed / (233280.0);
            };
            return function rand(number) {
                return Math.ceil(rnd(seed) * number);
            };
        })();
        console.log(rand(10))

13.获取浏览器地址栏的参数值

function GetQueryString(name)
{
     var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
     var r = window.location.search.substr(1).match(reg);
     if(r!=null)return  unescape(r[2]); return null;
}
 
// 调用方法
alert(GetQueryString("参数名1"));
alert(GetQueryString("参数名2"));
alert(GetQueryString("参数名3"));

14.关于cookie的使用

  （1）设置cookie的公用函数
    function setCookie(name , value ,iDay){
       var oDay = new Date();
         oDay.setDate(oDay.getDate()+iDay)
          document.cookie = name"="value+";exprice="+oDay
    }
    (2)获取cookie的值
     function getCookie(name){
        var arr = document.cookie.split("; ")
        for(var i=0;i<arr.length;i++){
                 var arr2 = arr.split("=")
                 if(arr2[0] == name){
                 return arr2[1]
                 }             
        }
        return ""
     
     }
  (3)删除cookie
   function removeCookie(name){
     setCookie(name;1;-1)
   }

15.常用的 js如何判断当前运行环境

 webkit = ua.match(/Web[kK]it[/]{0,1}([d.]+)/),
      android = ua.match(/(Android);?[s/]+([d.]+)?/),
      osx = !!ua.match(/(Macintosh; Intel /),
      ipad = ua.match(/(iPad).*OSs([d_]+)/),
      ipod = ua.match(/(iPod)(.*OSs([d_]+))?/),
      iphone = !ipad && ua.match(/(iPhonesOS)s([d_]+)/),
      webos = ua.match(/(webOS|hpwOS)[s/]([d.]+)/),
      win = /Wind{2}|Windows/.test(platform),
      wp = ua.match(/Windows Phone ([d.]+)/),
      touchpad = webos && ua.match(/TouchPad/),
      kindle = ua.match(/Kindle/([d.]+)/),
      silk = ua.match(/Silk/([d._]+)/),
      blackberry = ua.match(/(BlackBerry).*Version/([d.]+)/),
      bb10 = ua.match(/(BB10).*Version/([d.]+)/),
      rimtabletos = ua.match(/(RIMsTabletsOS)s([d.]+)/),
      playbook = ua.match(/PlayBook/),
      chrome = ua.match(/Chrome/([d.]+)/) || ua.match(/CriOS/([d.]+)/),
      firefox = ua.match(/Firefox/([d.]+)/),
      firefoxos = ua.match(/((?:Mobile|Tablet); rv:([d.]+)).*Firefox/[d.]+/),
      ie = ua.match(/MSIEs([d.]+)/) || ua.match(/Trident/[d](?=[^?]+).*rv:([0-9.].)/),
      webview = !chrome && ua.match(/(iPhone|iPod|iPad).*AppleWebKit(?!.*Safari)/),
      safari = webview || ua.match(/Version/([d.]+)([^S](Safari)|[^M]*(Mobile)[^S]*(Safari))/)
      
      校验是否是移动端
          if(navigator.userAgent.match(/(iPhone|iPod|Android|ios)/i)){
      ...
    }

16. 判断网页是否加载完成

document.onreadystatechange = function () {
    if (document.readyState == "complete") {
              //这里可以写页面加载完成后调用的方法
        }
}

17.校验图片加载失败处理函数

function preloadImages(arr) {
  var dfd = new $.Deferred()
  var newimages = []
  var i = 0
  var loaded = 0
  var loaderr = 0 // 加载失败的图片个数
  arr = ($.isArray(arr)) ? arr : [arr]

  for (; i < arr.length; i++) {
    newimages[i] = new Image()
    newimages[i].src = arr[i]
    newimages[i].onload = function() {
      loaded++
      if (loaded === arr.length) {
        dfd.resolve()
      }
    }
    newimages[i].onerror = function() {
      loaded++
      loaderr++

      // 全部加载失败
      if (loaderr === arr.length) {
        dfd.reject()
        return
      }
      if (loaded === arr.length) {
        dfd.resolve()
      }
    }
  }

  return dfd
}

preloadImages(['1.jpg', '2.jpg']).fail(function() {
  $('#div').text('无图片')
})