Package / code multiplexing method of reinforcing an array

Foreword

Some methods exist for arrays when writing JavaScript code, the page may be involved in a lot, and every time I go to write a bunch of code. Long-term effect of the particular code 繁多, it's time to wave the package, did not talk much to start writing 优美code

Code has been uploaded github, need to welcome Star ( HTTPS: //github.com/Xieguoiang ... ).

On the array of package methods

1. Array去重

`上文提到的Set的封装`
//ES6新增的Set数据结构，类似于数组，但是里面的元素都是唯一的 ，其构造函数可以接受一个数组作为参数
//ES6中Array新增了一个静态方法from，可以把类似数组的对象转换为数组
//方法二  new 
function removeRepeatArray(arr){
    return Array.from(new Set(arr))
}

2. Array顺序打乱

function upsetArr(arr){
    return arr.sort(function(){ return Math.random() - 0.5});
}

3. The array of most 大value most 小value

// this piece of packaging, primarily for digital array of type

function maxArr(arr){
    return Math.max.apply(null,arr);
}
function minArr(arr){
    return Math.min.apply(null,arr);
}

4 array 求和,平均值
this piece of packaging, primarily commodity demand for digital-type array total price of the total demand for a very popular
summation

function sumArr(arr){
    var sumText=0;
    for(var i=0,len=arr.length;i<len;i++){
        sumText+=arr[i];
    }
    return sumText
}

The average value, the decimal point may be a bit much, do not make your treatment may need to 保留多少位deal with their own look at it ~ ~

function covArr(arr){
    var sumText=sumArr(arr);
    var covText=sumText/length;
    return covText
}

5 array from the 随机acquired element

//类似抽奖了什么的 适应场合很多
function randomOne(arr) {
    return arr[Math.floor(Math.random() * arr.length)];
}
//randomOne([1,2,3,6,8,5,4,2,6])
//2
//randomOne([1,2,3,6,8,5,4,2,6])
//1

A return element 6 array (string) appears次数

function getEleCount (obj, ele) {
    var num = 0;
    for (var i = 0, len = obj.length; i < len; i++) {
        if (ele == obj[i]) {
            num++;
        }
    }
    return num;
}
//getEleCount('asd56+asdasdwqe','a')
//3
//getEleCount([1,2,3,4,5,66,77,22,55,22],22)
//2

... not 一一列举if necessary please 移步my github ~~

Packaging date and the date string

3-4 // include
a removal string of 空格four cases
removing all spaces type 1- spaces before and after the space 2- 3- 4- blank spaces before

function trim(str,type){
    switch (type){
        case 1:return str.replace(/\s+/g,"");
        case 2:return str.replace(/(^\s*)|(\s*$)/g, "");
        case 3:return str.replace(/(^\s*)/g, "");
        case 4:return str.replace(/(\s*$)/g, "");
        default:return str;
    }
}

2 search string 字段所出现的次数 ~

function countStr (str,strSplit){
    return str.split(strSplit).length-1
}

3. Date 5-7Date Date a certain time portion of the time倒计时

   function getEndTime(endTime){
    var startDate=new Date();  //开始时间，当前时间
    var endDate=new Date(endTime); //结束时间，需传入时间参数
    var t=endDate.getTime()-startDate.getTime();  //时间差的毫秒数
    var d=0,h=0,m=0,s=0;
    if(t>=0){
      d=Math.floor(t/1000/3600/24);
      h=Math.floor(t/1000/60/60%24);
      m=Math.floor(t/1000/60%60);
      s=Math.floor(t/1000%60);
    } 
    return "剩余时间"+d+"天 "+h+"小时 "+m+" 分钟"+s+" 秒";
} 

如需更多觉得`用的多的功能的封装`  欢迎留言/ 大家一起`进步`

Epilogue

This paper lists some common packaging JS, codes distal rope heteroaryl is a major flaw, we hope can learn ideas, packaged together, with progress

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Welcome to the front direction additive group Q 614569041

Foreword

On the array of package methods

Packaging date and the date string

Epilogue

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