JS去除数组中重复值的四种方法

在js编程中，经常会遇到数组操作，而去除数组中的重复值，在一些场景中也经常遇到。

本文分享四种方法，用于去除数组当中的重复值。供大家参考。

代码：

/// <summary>
/// 回车键按钮事件（此方法需要在页面加载完后执行，比如在jquery中的ready中调用）--方法一
/// </summary>
/// 调用示例：
/// var v_Array = new Array(1, 2, 3, 4, 5, 6, 7, 3, 3, 2, 2, 4, 2, 1, 1, 3);
/// var v_ArrayResult = v_Array.deleteEle();
/// alert(v_ArrayResult); //返回结果：, 2, 3, 4, 5, 6, 7 
Array.prototype.deleteEle = function () {
    var o = {}, newArr = [], i, j;
    for (i = 0; i < this.length; i++) {
if (typeof (o[this[i]]) == "undefined") {
    o[this[i]] = "";
}
    }
    for (j in o) {
newArr.push(j)
    }
    return newArr;
}
/// <summary>
/// 回车键按钮事件（此方法需要在页面加载完后执行，比如在Jquery中的ready中调用）--方法二
/// </summary>
/// 调用示例：
/// var v_Array = new Array(1, 2, 3, 4, 5, 6, 7, 3, 3, 2, 2, 4, 2, 1, 1, 3);
/// var v_ArrayResult = v_Array.deleteEleReg();
/// alert(v_ArrayResult); //返回结果：, 2, 3, 4, 5, 6, 7
Array.prototype.deleteEleReg = function () {
    return this.reverse().join(",").match(/([^,]+)(?!.*1)/ig).reverse();
}
/// <summary>
/// 回车键按钮事件（此方法需要在页面加载完后执行，比如在Jquery中的ready中调用）--方法三
/// </summary>
/// <param name="array">数组</param>
/// 调用示例：
/// var v_Array = new Array(1, 2, 3, 4, 5, 6, 7, 3, 3, 2, 2, 4, 2, 1, 1, 3);
/// alert(unique(v_Array)); //返回结果：, 2, 3, 4, 5, 6, 7
function deleteEleFunction(array) {
    var ret = [], record = {}, it, tmp, obj = "__object__", bak = [], i, len;
    var type = {
"number": function (n) { return "__number__" + n; },
"string": function (n) { return "__string__" + n; },
"boolean": function (n) { return "__boolean__" + n; },
"undefined": function (n) { return "__undefined__"; },
"object": function (n) {
    return n === null ? "__null__" : obj in n ? n[obj] : (n[obj] = obj + bak.push(n));
}
    };
    for (i = 0, len = array.length; i < len; i++) {
it = array[i]; tmp = type[typeof it](it);
if (!(tmp in record)) { ret.push(it); record[tmp] = true; }
    }
    for (i = 0, len = bak.length; i < len; delete bak[i++][obj]) { }
    return ret;
};

/// <summary>< xmlnamespace prefix ="o" ns ="urn:schemas-microsoft-com:office:office" />
/// 回车键按钮事件（此方法需要在页面加载完后执行，比如在Jquery中的ready中调用）--方法四
/// </summary>
/// 调用示例：
/// var v_Array = new Array(1, 2, 3, 4, 5, 6, 7, 3, 3, 2, 2, 4, 2, 1, 1, 3);
/// var v_ArrayResult = v_Array.deleteEleDis();
/// alert(v_ArrayResult); //返回结果：, 2, 3, 4, 5, 6, 7
Array.prototype.deleteEleDis = function () {
    var a = [], b = [];
    for (var prop in this) {
var d = this[prop];
if (d === a[prop]) continue; //防止循环到prototype
if (b[d] != 1) {
    a.push(d);
    b[d] = 1;
}
    }
    return a;
}