Array数组-JavaScript

Array数组

一些属性

.push（）//方法 往数组最后一位添加成员!
.unshift（）   // 往数组第一位添加成员!
.pop（）   //  将数组最后一位成员弹出!
.shift （）  // 将数组第一位成员弹出！
.join（） // 将数组转换成字符串!
.split（）// 将字符串重新生成数组！括号里面写分隔符（自定义的）；看字符串 
.reverse（） // 将数组成员倒序排列
.concat  （）//将两个数组进行合并！
.splice（1，2，3，4）//将数组中从下标为1的成员开始删除两个值 并在删除的位置添加3和4

一些实例

提取：http://www.taobao.com?username=zhangshan&password=123456 该网址里面的username和password部分。

 <script>
    
        var url1="http://www.taobao.com?username=zhangshan&password=123456";
        var skr = url1.split("?");
        var sk2=skr[1];
        var kkk=sk2.split("&");
        var t1=kkk[0];
        var t2=kkk[1];
        var user=t1.split("=");
        var pass=t2.split("=");
        document.write(user[1]);
        document.write("<br />")
        document.write(pass[1]);
</script>

数组去重复！

    <script>
    
        var arr = ["a","b","a","c","d","f","b","b","a","c","d","f","b","b","a","c","d","f","b","b","a","c","d","f","b","b","a","c","d","f","b","b","a","c","d","f","b","b","a","c","d","f","b","b","a","c","d","f","b","b","a","c","d","f","b","b","a","c","d","f","b","b","a","c","d","f","b"];
        var sum = [];
        var flag = true;
            for (var i in arr) {
                flag = true;
                for (var j in sum) {
                    if (arr[i] == sum[j]) {
                        flag = false;
                    }
                } if (flag) {
                    sum.push(arr[i]);
                }

            }
            document.write(sum);
    </script>

var math=["语文=99","数学=90","英语=88","历史=25","化学=30","生物=80","体育=99","物理=100","政治=70"];求最大最小平均分总分！

    <script>
    var math=["语文=99","数学=90","英语=88","历史=25","化学=30","生物=80","体育=99","物理=100","政治=70"];
    var fenshu1 = [];
    var fenshu2 = [];
        for (var index in math) {
                var fenshu1 = math[index].split("=");
                fenshu2.push(parseInt(fenshu1[1]));
            }
            fenshu2.sort(daxiao);

            var sum = 0;
            for (var index in fenshu2) {
                sum += fenshu2[index];
            }
 document.write("最低分为:" + fenshu2[0] + "<br />" + "最高分为：" + fenshu2[8] + "<br />" + "平均分为：" + sum / 9 + "<br />" + "总分为：" + sum)

//函数大小定义
            function daxiao(a, b) {
                if (a > b) {
                    return 1;
                } else if (a == b) {
                    return 0;
                } else if (a < b) {
                    return -1;
                }

            }
    
    </script>