利用js对象去除数组重复
http://www.iteye.com/topic/745230

// 先做一个数组var str = "1@1@2@3@3@4@4@5@";var ary = str.split("@");// 去重的算法var obj = {};for (var i = 0; i < ary.length; i++) {    obj[ary[i]] = ary[i];}// 查看结果var str2 = "";for (var key in obj) {    str2 += obj[key];}alert(str2);