1.构建对象的方法

<script>

        //构建对象方法

        //第1种

        var people = new Object();

        people.name = "iwen";

        people.age = 26;

        document.write("name:" + people.name + ",age:" + people.age + "<br>");

        //第2种

        people1 = { name: "zhangsan", age: 27 };

        document.write("name:" + people1.name + ",age:" + people1.age + "<br>");

        //第3种

        function peopleConstructor(name, age) {

            this._name = name;

            this._age = age;

        }

        son = new peopleConstructor("liuz", 28);

        document.write("name:" + son._name + ",age:" + son._age + "<br>");

    </script>

2.String字符串对象

1.查找：indexOf()

2.内容匹配：match()

        var str = "Hello World";

        //匹配

        document.write(str.match("World")+"<br>");

        document.write(str.match("world"));

3.替换:replace()

4.大小写转换：toUpperCase() \ toLowerCase()

      //转换大写

        str=str.toUpperCase();

        document.write(str + "<br>");

        //转换小写

        str = str.toLowerCase();

        document.write(str + "<br>");

5.字符串转为数组：split()

var str1 = "Hello Bai du";

        //document.write(str1 + "<br>");

        var s = str1.split(" ");

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

            document.write(s[i] + "<br>");

        }

3.Date日期对象

getFullYear()：获取年份

getTime()：获取毫秒

setFullYear()：设置具体日期

getDay()：获取星期

<div id="timetxt">

    </div>

    <script type="text/javascript">

        var date = new Date();

        document.write(date);

        document.write("<br>");

        //获取年份

        document.write(date.getFullYear());

        document.write("<br>");

        //获取毫秒

        document.write(date.getTime());

        startTime();

        function startTime() {

            var today = new Date();

            var h = today.getHours();

            var m = checkTime(today.getMinutes());

            var s = checkTime(today.getSeconds());

            document.getElementById("timetxt").innerHTML = h + ":" + m + ":" + s;

            setTimeout(function () {

                startTime();

            }, 2000);

        }

        function checkTime(i) {

            if (i < 10) {

                i = "0" + i;

            }

            return i;

        }

    </script>

4.Array数组对象

concat()：合并数组

sort()：排序

push()：末尾追加元素

reverse()：数组元素翻转

        document.write('--------------合并-------------<br>');

        var a = ["hello", "world"];

        var b = ["tang", "sansan"];

        var c = a.concat(b);

        document.write("c:" + c);

        document.write('<br>---------------排序------------<br>');

        var d = ["a", "c", "d", "t", "b", "e"];

        d.sort();

        document.write(d);

        document.write('<br>--------------末尾追加-----------<br>');

        var e = ["hello", "world"];

        e.push("tangsansan");

        document.write(e);

        document.write('<br>---------------翻转------------<br>');

        c.reverse();

        document.write(c);

5.Math对象

算数任务

round()：四舍五入

random()：返回 0 ~ 1 之间的随机数

max()：返回最高值

min()：返回中的最低值

abs()：绝对值

        var num = 2.5;

        document.write('---------------Math.round------------<br>');

        document.write(Math.round(num));

        document.write('<br>---------------1~100的随机数------------<br>');

        document.write(parseInt(Math.random() * 100));

        document.write('<br>---------------最大值------------<br>');

        document.write(Math.max(num, 23, 52, 77, 32));

        document.write('<br>---------------最小值------------<br>');

        document.write(Math.min(num, 23, 52, 77, 32));

        document.write('<br>--------------绝对值------------<br>');

        var abs1 = 10;

        var abs2 = -10;

        document.write(Math.abs(abs1));

        document.write('<br>');

        document.write(Math.abs(abs2));