zoukankan      html  css  js  c++  java
  • JavaScript数组删除重复元素(去重)的方法

    1.

    var arr=str.split("");   
    for(var i=0;arr.length-1>i;i++){   
        for(var j=i+1;j<arr.length;j++){   
            if(arr[j]==arr[i]){    
                arr.splice(j,1);   //删除之后,数组长度随之减少   
                j--;   
            }   
        }   
    }   
    //alert(arr.toString());   //生成的字符串由逗号隔开
    
    //arr.join("");  //生成的字符串无分割符     
    //arr.join("-");  //join方法可指定生成的字符串的分隔符 

    2.

    Array.prototype.unique = function() {  
        var data = [];  
        var a = {}; //声明一个对象,javascript的对象可以当哈希表用  
        for (var i = 0; i < this.length; i++) {  
            if(!a[this[i]]){  
                a[this[i]] = true;  
                data[data.length] = this[i];  
            }  
        }  
        return data;  
    };  
    var a = new Array("5","7","7");  
    alert(a);  
    alert(a.unique());  

    3.

    Array.prototype.del = function(){
       var a = {}, c = [], l = this.length;
       for (var i = 0; i < l; i++) {
         var b = this[i];
         var d = (typeof b) + b;
         if (a[d] === undefined) {
            c.push(b);
            a[d] = 1;
        }
       }
       return c;
    }
    
    var arr = [1,2,5,2,7,3,8];
    alert(arr.del());
  • 相关阅读:
    WPF Margin和Padding
    WPF Tab切换顺序设置
    WPF DataGrid DataGridTemplateColumn
    WPF CheckBox IsHitTestVisible
    WPF Tag
    WPF RadioButton
    WPF 用户控件(UserControl)
    WPF ToolTip
    Style Lessons in Clarity and Grace (11th Edition)中文翻译
    AI for AI
  • 原文地址:https://www.cnblogs.com/dxchen/p/5956811.html
Copyright © 2011-2022 走看看