[原创]获取JS数组最大值、最小值

    //最小值
    Array.prototype.min = function() {
    var min = this[0];
    var len = this.length;
    for (var i = 1; i < len; i++){
    if (this[i] < min){
    min = this[i];
    }
    }
    return min;
    }
    //最大值
    Array.prototype.max = function() {
    var max = this[0];
    var len = this.length;
    for (var i = 1; i < len; i++){
    if (this[i] > max) {
    max = this[i];
    }
    }
    return max;
    }

var arr = new Array(1，8,7,5,);
console.log(arr.max());
console.log(arr.min());