1.数组合并去重

function arrMergeDeduplication(arr1,arr2){   var concatArray = arr1.concat(arr2); //合并数组   var newArray = [];   for(var i = 0; i < concatArray.length; i++){       if(newArray.indexOf(concatArray[i]) == -1){           newArray.push(concatArray[i])       }     }   return newArray;}复制代码

2.数组排序

1.使用sort()方法排序function arraySort(arr){  var arr = arr;  var compare = function(x,y){      if(x>y){        return -1;      }else if(x
    
     arr[j]){           t = arr[j];           arr[j] = arr[i];           arr[i] = t;        }     }  }  return arr;}复制代码
    

3.数组筛选

var arr = [1,2,3,4,5];var condition = function(x){  if(x>2){    return x;  }}var newarr = arr.filter(condition);console.log(newarr) //[3,4,5]复制代码

4.数组与字符串的转换

var arr = [1,2,3,4,5];//转字符串var arrString = arr.toString(); //"1,2,3,4,5"var arrString = arr.join(','); //"1,2,3,4,5"//转数组var arr = arrString.split(','); //[1,2,3,4,5]复制代码

5.数组截取

var arr = ['a', 'b', 'c'];    arr.slice(0)         // ["a", "b", "c"]  arr.slice(1)         // ["b", "c"]  arr.slice(1, 2)     // ["b"]  arr.slice(2, 6)     // ["c"]  arr.slice()           // ["a", "b", "c"]    无参数返回原数组    arr.slice(-2)          // ["b", "c"]    参数是负数，则表示倒数计算的位置  arr.slice(-2, -1)     // ["b"] 复制代码