JS数组去重的两种方法

数组去重-正则表达式

Array.prototype.unique = function () { //array原型扩展  
    return this.sort().join(",,").replace(/(,|^)([^,]+)(,,)+(,|$)/g,"$1$2$4").replace(/,,+/g,",").replace(/,$/,"").split(",");  
}  
//使用方法举例 
var arr = ["a","b","c","a","d","e","c","f","d"];  
var newArr = arr.unique(); //["a","b","c","d","e","f"]

数组去重-match()方法

function ArrUnique(arr){ 
    var newArr = []; 
    for(var i=0;i< arr.length;i++){ 
        if(newArr.toString().match(arr[i]) == null){ 
            newArr.push(arr[i]); 
        } 
    } 
    return newArr; 
} 
var myArr=["a","b","c","a","d","e","c","f","d"]; 
var myNewArr = ArrUnique(myArr); //["a","b","c","d","e","f"]

说明：toString()数组转换成字符串；match()匹配字符串，返回值：null或匹配到的字符串；如果返回null表示该字符串没有重复，进而push()追加到新的数组里。

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