课程 \
JavaScript进阶篇
7-11 提取指定数目的字符substr()
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script type="text/javascript">
var mystr="Hello World!";
document.write(mystr.substr(6,6) + "<br />");
document.write(mystr.substr(0,5) );
</script>
</head>
<body>
</body>
</html>
2015-04-25
查看完整代码
7-13 向上取整ceil()
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Math </title>
<script type="text/javascript">
document.write(Math.ceil(3.3) + "<br />")
document.write(Math.ceil(-0.1) + "<br />")
document.write(Math.ceil(-9.9) + "<br />")
document.write(Math.ceil(8.9))
</script>
</head>
<body>
</body>
</html>
2015-04-25
查看完整代码
7-14 向下取整floor()
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Math </title>
<script type="text/javascript">
document.write(Math.floor(3.3)+"<br>");
document.write(Math.floor(-0.1)+"<br>");
document.write(Math.floor(-9.9)+"<br>");
document.write(Math.floor(8.9));
</script>
</head>
<body>
</body>
</html>
2015-04-25
查看完整代码
7-15 四舍五入round()
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Math </title>
<script type="text/javascript">
document.write(Math.round(3.3)+ "<br>");
document.write(Math.round(-0.1)+ "<br>");
document.write(Math.round(-9.9)+ "<br>");
document.write(Math.round(8.9));
</script>
</head>
<body>
</body>
</html>
2015-04-25
查看完整代码
7-16 随机数 random()
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Math </title>
<script type="text/javascript">
document.write(Math.round(Math.random()*10));
</script>
</head>
<body>
</body>
</html>
2015-04-25
查看完整代码
7-18 数组连接concat()
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Array对象 </title>
<script type="text/javascript">
var myarr1= new Array("010")
var myarr2= new Array("-","84697581");
document.write( myarr1.concat(myarr2) );
</script>
</head>
<body>
</body>
</html>
2015-04-25
查看完整代码
7-19 指定分隔符连接数组元素join()
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Array对象 </title>
<script type="text/javascript">
var myarr1= new Array("86","010")
var myarr2= new Array("84697581");
var myarr3= myarr1.concat(myarr2);
document.write(myarr3.join("-"));
</script>
</head>
<body>
</body>
</html>
2015-04-25
查看完整代码
7-20 颠倒数组元素顺序reverse()
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Array对象 </title>
<script type="text/javascript">
var myarr1= ["我","爱","你"];
document.write(myarr1.reverse())
</script>
</head>
<body>
</body>
</html>
2015-04-25
查看完整代码
7-21 选定元素slice()
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Array对象 </title>
<script type="text/javascript">
var myarr1= ["我","爱","你"];
document.write(myarr1.slice(1,3));
</script>
</head>
<body>
</body>
</html>
2015-04-25
查看完整代码
7-22 数组排序sort()
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Array对象 </title>
<script type="text/javascript">
function sortNum(a,b) {
return b-a;
}
var myarr = new Array("80","16","50","6","100","1");
document.write(myarr.sort(sortNum));
</script>
</head>
<body>
</body>
</html>
2015-04-25
查看完整代码
7-23 编程练习
<!DOCTYPE HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>系好安全带,准备启航</title>
<script type="text/javascript">
//通过javascript的日期对象来得到当前的日期，并输出。
var mydate=new Date();
var weekday=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
//成绩是一长窜的字符串不好处理，找规律后分割放到数组里更好操作哦
var scoreStr = "小明:87;小花:81;小红:97;小天:76;小张:74;小小:94;小西:90;小伍:76;小迪:64;小曼:76";
var sum=0;
for(i=3;i<scoreStr.length;i+=6)
{
sum+=parseInt(scoreStr.substr(i,2));
}
var average=Math.floor(sum/(i/7+1));
//从数组中将成绩撮出来，然后求和取整，并输出。
document.write(mydate.getFullYear()+"年"+(mydate.getMonth()+1)+"月"+mydate.getDate()+"日 "+weekday[mydate.getDay()]+"--班级总分为:"+average);
</script>
</head>
<body>
</body>
</html>
2015-04-25
查看完整代码
8-1 window对象
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>window对象</title>
<script type="text/javascript">
alert("欢迎来到慕课网");
function opennew(){
window.open('http://www.imooc.com','width=600,height=400')
}
</script>
</head>
<body>
<form>
<input type="button" value="点击我，打开新窗口" onClick="opennew()" />
</form>
</body>
</html>
2015-04-25
查看完整代码
8-3 计时器setInterval()
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>定时器</title>
<script type="text/javascript">
var attime;
function clock(){
var time=new Date();
attime= time.getHours()+":"+time.getMinutes()+":"+time.getSeconds() ;
document.getElementById("clock").value = attime;
}
setInterval(clock;1000);
</script>
</head>
<body>
<form>
<input type="text" id="clock" size="50" />
</form>
</body>
</html>
2015-04-25
查看完整代码
8-4 取消计时器clearInterval()
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>计时器</title>
<script type="text/javascript">
function clock(){
var time=new Date();
document.getElementById("clock").value = time;
}
var i=setInterval("clock()",1000);
</script>
</head>
<body>
<form>
<input type="text" id="clock" size="50" />
<input type="button" value="Stop" onclick="clearInterval(i)"/>
</form>
</body>
</html>
2015-04-26
查看完整代码
8-5 计时器setTimeout()
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>计时器</title>
</head>
<script type="text/javascript">
var num=0;
function startCount() {
document.getElementById('count').value=num;
num=num+1;
setTimeout("startCount()",1000);
}
setTimeout("startCount()",1000);
</script>
</head>
<body>
<form>
<input type="text" id="count" />
</form>
</body>
</html>
2015-04-26
查看完整代码
8-6 取消计时器clearTimeout()
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>计时器</title>
</head>
<script type="text/javascript">
var num=0;
var i;
function startCount(){
document.getElementById('count').value=num;
num=num+1;
i=setTimeout("startCount()",1000);
}
function stopCount(){
clearTimeout(i);
}
</script>
</head>
<body>
<form>
<input type="text" id="count" />
<input type="button" value="Start" onclick="startCount()"/>
<input type="button" value="Stop" onclick="stopCount()" />
</form>
</body>
</html>
2015-04-26
查看完整代码
8-7 History 对象
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>History对象</title>
</head>
<script type="text/javascript">
var HL =window.history.length ;
document.write(HL);
</script>
<body>
</body>
</html>
2015-04-26
查看完整代码
首页上一页123456下一页尾页