js 判断字符串是否有重复项 给出提示

 

js判断数组中的字符串是否有重复项，并给出提示

var ary = ["100201_外币", "100201_外币", "1123_预付账款/北京"]

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

for(var i=0;i<ary.length;i++) {

if(s.replace(ary[i]+",","").indexOf(ary[i]+",")>-1) {

alert("数组中有重复元素：" + ary[i]);

break;

}

}