JavaScript—内置对象

来源：互联网发布：想转行java 编辑：程序博客网时间：2024/04/29 12:34
<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>标签</title></head><body onload="startTime()"><!--创建对象-->    <script>    <!--创建方式1-->//    people = new Object();//    people.name = "iwen";//    people.age = "30";//    document.write("name:"+people.name+",age:"+people.age);//创建方式2://    people = {name:"iwen",age:"30"};//    document.write("name:"+people.name+",age:"+people.age);//使用函数创建对象//    function people(name,age){//        this.name = name;//        this.age = age;//    }//    son = new people("iwen","20");//    document.write("name:"+son.name+",age:"+son.age);//    var str = "hello world";//    var str1 = "today is monday";//    document.write(str.length);//    document.write(str.indexOf("hello"));////    document.write(str.match("hello1"));////    document.write(str.replace("world","you are mine"));  // 第一个是原本的,第二个是替换过后的参数////    document.write(str.toUpperCase());//    将字符串转换为数组//    var s = str1.split(" ");  // 以空格来作为数组转换为数组的标志//    document.write(s[1]);//    document.write(str.prototype);        var date = new Date();//        document.write(date);//        document.write(date.getFullYear());  // 获取年份//        document.write(date.getTime()); // 获取时间戳,精确到毫秒//        date.setFullYear(2012,1,1); // 自己设定时间//        document.write(date);//          document.write(date.getDay()); // 获取星期        // 显示当前的小时,分钟,秒//        function startTime(){//            var today = new Date();//            var h = today.getHours();//            var m = today.getMinutes();//            var s = today.getSeconds();//            m = checkTime(m);//            s = checkTime(s);//            document.getElementById("timetxt").innerHTML = h+":"+m+":"+s;//            // 让日期每500毫秒刷新一次,设置递归函数//            t = setTimeout(function(){//                startTime();//            },500);//        }//        // 由于秒和分钟有个位数和两位数,因此进行判断,记得在上方调用函数 startTime()//        function checkTime(i){//            if (i < 10){//                i = "0"+i;////            }return i;//       }    // 数组的元素操作//        var a = ["hello","world"];//        var b = ["iwen","ime"];//         // 合并数组元素//        var c = a.concat(b);//        document.write(c);//        var a = ["a","b","c","d","e"];//        document.write(a.sort());  // 进行排序//        var a = ["2","3","5","1","4"];//        document.write(a.sort(function(a,b){//            return a - b; // 意思是从a 到 b,   进行升序排列;  如果是从b 到a ,就是降序排列//        }));//        var a = ["a","b"];//        document.write(a.push("c")); //追加元素,也就是给数组末尾添加一个元素//        document.write(a.reverse());  //  反转数组元素排列        // Math 对象    /*        round(): 四舍五入        random(): 返回0~1之间的随机数        max():返回最高值        min(): 返回最低值        abs(): 返回绝对值     */        document.write(Math.round(2.8)+"<br/>");        document.write(Math.random()+"<br/>");        document.write(Math.min("1","22","4","12")); //最大值和最小值    </script><div id = "timetxt"></div></body></html>
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