<!DOCTYPE html>

 <html>

 <head lang="en">

     <meta chaset="UTF-8">

     <title></title>

 </head>

 <body>

     <script>

         people = new Object(); 　　　　//javascript对象的创建

         //对people对象属性赋值第一种方式

         people.name = "jerry";  　　  //对people对象的name属性赋值

         people.age = "18";      　    //对people对象的age属性赋值

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

         //对people对象属性赋值第二种方式

         people = {name:"tom",age:"15"};//对people对象的name属性、age属性赋值

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

     </script>

 </body>

 </html>

 <!DOCTYPE html>

 <html>

 <head lang="en">

     <meta chaset="UTF-8">

     <title></title>

 </head>

 <body>

     <script>

         //自定义对象的创建

         //使用函数来创建对象，然后创建对象实例

         function people(name,age){

             this.name = name;

             this.age = age;

         }

         son = new people("tom",30);

         document.write("name:"+son.name+",age:"+son.age);

     </script>

 </body>

 </html>

 <!DOCTYPE html>

 <html>

 <head lang="en">

     <meta chaset="UTF-8">

     <title></title>

 </head>

 <body>

     <script>

         var str = "Hello World";

         document.write("字符串长度："+str.length+"</br>");

         document.write("查询字符串的位置："+str.indexOf("World")+"</br>");

         document.write("匹配字符串是否存在，若存在输出这个字符，若不存在输出空:"+str.match("World")+"</br>")

         document.write("替换字符串:",str.replace("World","javascript")+"</br>");

         document.write("字符串转换成大写:"+str.toUpperCase()+"</br>");

         document.write("字符串转换成小写:"+str.toLowerCase()+"</br></br>");

         var str1 = "Hello,tom,jerry,gophi";

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

         var s = str1.split(",");

         document.write("字符串分割之后的结果:</br>");

         document.write(s[0]+"</br>");

         document.write(s[1]+"</br>");

         document.write(s[2]+"</br>");

         document.write(s[3]+"</br>");

     </script>

 </body>

 </html>

 <!DOCTYPE html>

 <html>

 <head lang="en">

     <meta chaset="UTF-8">

     <title></title>

 </head>

 <body>

     <script>

         var date = new Date();

         document.write("时间："+date+"</br>");　　　　　　　//获取时间总信息

         document.write(+date.getFullYear()+"年</br>");　　//获取年份

         document.write("星期"+date.getDay()+"</br>"); 　　//获取星期几

         document.write("时间戳："+date.getTime()+"</br>");//获取时间戳

         date.setFullYear(2000,1,1)　　　　　　　　　　　　　//设置时间

         document.write("设置时间为："+date+"</br>");　　  //获取时间总信息

     </script>

 </body>

 </html>

 <!DOCTYPE html>

 <html>

 <head lang="en">

     <meta chaset="UTF-8">

     <title></title>

 </head>

 <body onload="startTime()"> <!--用一个onload事件调用startTime函数-->

     <script>

         function startTime(){

             var today = new Date();

             var h = today.getHours();    //获取时

             var m = today.getMinutes();    //获取分

             var s = today.getSeconds(); //获取秒

             m = checkTime(m);

             s = checkTime(s);

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

             t = setTimeout(function(){startTime();},1000);      //每1000毫秒刷新一次时间

             //checkTime函数的作用是使分、秒为个位数时仍输出两位，比如9分5秒，输出09:05

         }

         function checkTime(i){

             if(i<10){

                 i = "0" + i;

             }

             return i;

         }

     </script>

     <div id="timetxt"></div>            <!--设置一个显示时间的标签-->

 </body>

 </html>

 <!DOCTYPE html>

 <html>

 <head lang="en">

     <meta chaset="UTF-8">

     <title></title>

 </head>

 <body>

     <script>

         //concat():合并数组

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

         var b=["tom","jerry"];

         var c=a.concat(b);

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

         //sort():排序

         var aa=["a","e","c","v","b"];

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

         var bb=[1,9,2,3,4,7,8,5];

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

         //push():末尾追加元素

         var cc=["a","b"];

         cc.push("c");

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

         //reverse():数组元素翻转

         var dd=["1","2","3","4","5"];

         document.write(dd.reverse());

     </script>

 </body>

 </html>

 <!DOCTYPE html>

 <html>

 <head lang="en">

     <meta chaset="UTF-8">

     <title></title>

 </head>

 <body>

     <script>

         //round(),四舍五入

         document.write(Math.round(2.5)+"</br>");

         //random(),0~1之间的随机数

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

         //parseInt(),取整

         document.write(parseInt(Math.random()*10)+"</br>");//求0~10之间的随机整数

         //max(),求最大值

         document.write(Math.max(10,2000,1,35,6.7,-10)+"</br>");

         //min(),求最小值

         document.write(Math.min(10,2000,1,35,6.7,-10)+"</br>");

         //abs(),求绝对值

         document.write(Math.abs(-10));

     </script>

 </body>

 </html>