JS判斷數組中是否有重複值得三種實用方法_javascript技巧

方法一:

複製程式碼 程式碼如下:

var ary = new Array("111" ,"22","33","111");

var s = ary.join(",") ",";

for(var i=0;i
if(s.replace(ary[i] ",","").indexOf(ary[i] ",")>-1) {

alert("陣列中有重複元素：" ary[i]);

break;外語屋

}

}

}

方法二:

複製程式碼

程式碼如下:


var ary = new Array("111 ","22","33","111");

var nary=ary.sort();

for(var i=0;i
if (nary[i]==nary[i 1]){

alert("陣列重複內容：" nary[i]);

}

}

方法三: 內陸運輸

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複製程式碼

function isRepeat(arr){

var hash = {};

for(var i in arr) {

for(var i in arr) { if(>if(>if( hash[arr[i]]) return true; hash[arr[i]] = true; } return false }