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));