js 小方法

不定期更新一些js小方法

数组

数组存在

function inArray(val,arr) {
	let arlen = arr.length;	
	let test = '';		
    for (let s = 0; s < arlen; s++) {
        test = arr[s].toString();
        if (test == val) {
            return true;
        }
    }
    return false;
};

对象拷贝

function deepCopyObj(obj) { 

	let str, result = obj.constructor === Array ? [] : {};
    if(typeof obj !== 'object'){
        return;
    } else if(window.JSON){
        str = JSON.stringify(obj), 
        result = JSON.parse(str); 
    } else {
        for(let i in obj){
            result[i] = typeof obj[i] === 'object' ? deepCopyObj(obj[i]) : obj[i]; 
        }
    }

    return result; 
};

日期

日期格式化

function formatTime(time,fmt) {
  fmt = fmt || 'yyyy-MM-dd'
  time = new Date(time)
  let o = {
    "M+": time.getMonth() + 1,
    "d+": time.getDate(),
    "H+": time.getHours(),
    "m+": time.getMinutes(),
    "s+": time.getSeconds(),
    "S+": time.getMilliseconds()
  };

  if (/(y+)/.test(fmt)) {
    fmt = fmt.replace(RegExp.$1, (time.getFullYear() + "").substr(4 - RegExp.$1.length));
  }
  for (let k in o) {
    if (new RegExp("(" + k + ")").test(fmt)) {
      fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(String(o[k]).length)));
    }
  }
  return fmt;
}

字符串String

字符串分隔空格

function andleSplit(str){
    var temp = str.split(/[\s+,]/g);
    for (var i = 0; i < temp.length; i++) {
        if (temp[i] == "") {                    
            temp.splice(i, 1);
            i--;
        }
    }
    return temp;
}

string 替换

String.prototype.format = String.prototype.f = function () {
    var s = this,
        i = arguments.length;
    while (i--) {
        s = s.replace(new RegExp('\\{' + i + '\\}', 'gm'), arguments[i]);
    }
    return s;
};
var template1="我是{0}，今年{1}了,biubiubiu{2}";
var result1=template1.format("loogn",22,9090);

数字Number

数字千分位格式化

function toThousands(num) {
    var num = (num || 0).toString(), result = '';
    while (num.length > 3) {
        result = ',' + num.slice(-3) + result;
        num = num.slice(0, num.length - 3);
    }
    if (num) { result = num + result; }
    return result;
}

url

url 分割query

function splitParam(href) {
    href = href || location.search;
    var arr={},
    reg = new RegExp( "([^?=&]+)(=([^&]*))?", "g" );
    href && href.replace(reg,function( $0, $1, $2, $3 ){
        arr[$1] = $3;    
    });
    return arr;
}

url 分割query

保留部分参数

function addParam(href) {
    href = href || location.search;
    var name = ['f','ref','isapp','ssc','usc','td','dgfromsource','_vs'],
    str='',
    arr={},
    reg = new RegExp( "([^?=&]+)(=([^&]*))?", "g" );
    href && href.replace(reg,function( $0, $1, $2, $3 ){
        if (name.includes($1)) {            
            arr[$1] = $3;
        }        
    });
    for(var i in arr){
        str +=  i + '=' + arr[i] + '&';
    }
    if (str.length) {
        str = str.substring(0, str.length-1);
    }
    return str;
}

a标签 解析 url

function parseURL(url) {
    var a = document.createElement('a');
    a.href = url;
    return {
        source: url,
        protocol: a.protocol.replace(':', ''),
        host: a.hostname,
        port: a.port || '80',
        query: a.search,
        params: (function() {
            var ret = {},
                seg = a.search.replace(/^\?/, '').split('&'),
                len = seg.length,
                i = 0,
                s;
            for (; i < len; i++) {
                if (!seg[i]) { continue; } s = seg[i].split('=');
                ret[s[0]] = s[1];
            }
            return ret;
        })(),
        file: (a.pathname.match(/\/([^\/?#]+)$/i) || [, ''])[1],
        hash: a.hash.replace(' #', ''),
        path: a.pathname.replace(/^([^\/])/, '/$1'),
        relative: (a.href.match(/tps?:\/\/[^\/]+(.+)/) || [, ''])[1],
        segments: a.pathname.replace(/^\//, '').split('/')
    };
}

字符串混淆 加密 解密

function strChange(str,c){
    if (c){
      let nstr = '' ,
      index = str.indexOf('L'),
      iSplit = str.substr(0,index),
      ilen = str.length
      let arr = Array.from(str)
      let j = 0;
      let mixL = iSplit >= 24 ? 24 : iSplit;
      let after = '';
      for(let i=index+1;i<ilen;i+=2){
        if (j >= mixL){
          after = str.substr(i)
          break;
        }
        nstr += arr[i]
        j++
      } 
      return nstr + after
    }else{
      let ilen = str.length, nstr = ilen + 'L',flag = (Math.random().toString(36) + new Date().getTime()).substr(2)
      let arr = Array.from(str),brr = Array.from(flag)
      let mixL = ilen <= 24 ? ilen : 24;
      let after = ilen <= 24 ? '' : str.substr(24);
      for(let i=0;i<mixL;i++){
        nstr += arr[i] + brr[i]
      } 
      return nstr + after
    }
  }

strChange('kokier')
//"6Lkcopkeipe5rw"
strChange("6Lkcopkeipe5rw",1)
//"kokier"

Storage

var myPerson = {
    set: function (str) {
        var isIn = false,
            pers = window.localStorage.firList,
            perList = [];

        if (pers != undefined) {

            perList = JSON.parse(pers);

            for(var i = 0,perLen = perList.length; i < perLen; i++){
                if (JSON.stringify(str) == JSON.stringify(perList[i])) {
                    isIn = true;
                    break;
                }
            }

        }
        if (!isIn) {
            perList.push(str);
            window.localStorage.removeItem('firList');
            window.localStorage.firList = JSON.stringify(perList);
        }
    },
    get: function () {
        var perList = [],
            uLists = [],
            pers = window.localStorage.firList;

        if (pers != undefined) {

            perList = JSON.parse(pers);

            for(var i = 0; i < perList.length; i++){
                uLists[perList[i].user_id] = perList[i];
            }
        }
        return uLists;
    },
    remove: function (strId) {
        var isDel = false,pers = window.localStorage.firList,perList = [];
        if (pers != undefined) {

            perList = JSON.parse(pers);

            for(var i = 0,perLen = perList.length; i < perLen; i++){
                if (strId == perList[i].user_id) {
                    perList.splice(i,1);
                    isDel = true;
                    window.localStorage.removeItem('firList');
                    window.localStorage.firList = JSON.stringify(perList);
                    break;
                }
            }
        }
        return isDel;
    }
}

排序相关

乱序：

var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
arr.sort(function () {
    let a = Math.random() - 0.5;
    return a;
});

正序 从小到大

function quickSort(arr) {
    if(arr.length <= 1) {
        return arr;  
    }
    var left = [],
        right = [],
        current = arr.splice(0,1); 
    for(let i = 0; i < arr.length; i++) {
        if(arr[i] < current) {
            left.push(arr[i])  
        } else {
            right.push(arr[i])
        }
    }
    return quickSort(left).concat(current,quickSort(right));
}

倒序 从小到大

function quickSort(arr) {
    if(arr.length <= 1) {
        return arr;  
    }
    var left = [],
        right = [],
        current = arr.splice(0,1); 
    for(let i = 0; i < arr.length; i++) {
        if(arr[i] < current) {
            left.push(arr[i])  
        } else {
            right.push(arr[i])
        }
    }
    return quickSort(left).concat(current,quickSort(right));
}