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课程 \ JavaScript进阶篇

JavaScript进阶篇

代码 102 问答 1
按时间 按章节
7-5 返回/设置时间方法
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>日期对象 </title>
<script type="text/javascript">
var mydate=new Date();
document.write("当前时间："+mydate+"<br>");
mydate.setTime( mydate.getTime() + 2* 60 * 60 * 1000);
document.write("推迟二小时时间：" + mydate);
</script>
</head>
<body>
</body>
</html>
2019-01-14 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>
<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>
2018-07-27 查看完整代码
7-6 String 字符串对象
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>string对象 </title>
<script type="text/javascript">
var message="I love JavaScript!";
var mychar=message.toLowerCase() ;
document.write("字符串为："+mychar+"<br>");
document.write(message.toUpperCase);
</script>
</head>
<body>
</body>
</html>
2018-07-26 查看完整代码
7-7 返回指定位置的字符
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>string对象 </title>
<script type="text/javascript">
var mystr="I love JavaScript!"
document.write(mystr.charAt(mystr.length-1) );
</script>
</head>
<body>
</body>
</html>
2018-07-26 查看完整代码
7-4 返回星期方法
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>获得星期</title>
<script type="text/javascript">
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"];
document.write("今天是：" + mydate.getDay()+"<br>");
document.write( mydate.getYear()+"<br>");
document.write( mydate.getMonth()+1+"<br>");
document.write( mydate.getMinutes()+"<br>");
document.write( mydate.getSeconds()+"<br>");
</script>
</head>
<body>
</body>
</html>
2018-07-26 查看完整代码
7-2 Date 日期对象
2018-07-26 查看完整代码
7-1 什么是对象
<html>
<head>
<script type="text/javascript">
var myarray=new Array(5);
mynum = myarray.length;
document.write("数组长度:"+mynum);
</script>
</head>
<body>
</body>
</html>
2018-07-26 查看完整代码
6-11 编程练习
<!DOCTYPE html>
<html>
<head>
<title> 事件</title>
<script type="text/javascript">
function count(){

//获取第一个输入框的值
var a = document.getElementById('txt1').value;
//获取第二个输入框的值
var b = document.getElementById('txt2').value;
//获取选择框的值
var c = document.getElementById('select').value;
var d = "";
//获取通过下拉框来选择的值来改变加减乘除的运算法则
switch(c){
case "+":
d = parseInt(a)+parseInt(b);
break;
case "-":
d = parseInt(a)-parseInt(b);
break;
case "*":
d = parseInt(a)*parseInt(b);
break;
default:
case "/":
d = parseInt(a)/parseInt(b);
}
//设置结果输入框的值
document.getElementById('fruit').value = d;
}
</script>
</head>
<body>
<input type='text' id='txt1' />
<select id='select'>
<option value='+'>+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
<input type='text' id='txt2' />
<input type='button' value=' = ' onclick=count() /> <!--通过 = 按钮来调用创建的函数，得到结果-->
<input type='text' id='fruit' />
</body>
</html>
2018-07-26 查看完整代码
6-10 卸载事件（onunload）
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title> 卸载事件 </title>
<script type="text/javascript">
window.onunload = onunload_message;
function onunload_message(){
alert("您确定离开该网页吗？");
}
</script>
</head>
<body onunload="onunload_message">
欢迎学习JavaScript。
</body>
</html>
2018-07-26 查看完整代码
6-9 加载事件（onload）
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title> 加载事件 </title>
<script type="text/javascript">
function message(){
alert("加载中，请稍等…"); }
</script>
</head>
<body onload="message()">
欢迎学习JavaScript。
</body>
</html>
2018-07-26 查看完整代码
6-8 文本框内容改变事件（onchange）
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title> 文本框内容改变事件 </title>
<script type="text/javascript">
function message(){
alert("您改变了文本内容！"); }
</script>
</head>
<body>
<form>
个人简介：<br>
<textarea name="summary" cols="60" rows="5"onchange="message()">请写入个人简介，不少于200字！</textarea>
</form>
</body>
</html>
2018-07-26 查看完整代码
6-7 内容选中事件（onselect）
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title> 内容选中事件 </title>
<script type="text/javascript">
function message(){
alert("您触发了选中事件！"); }
</script>
</head>
<body>
<form>
个人简介：<br>
<textarea name="summary" cols="60" rows="5"onselect="message()">请写入个人简介，不少于200字！</textarea>
</form>
</body>
</html>
2018-07-26 查看完整代码
6-6 失焦事件（onblur）
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title> 失焦事件 </title>
<script type="text/javascript">
function message(){
alert("请确定已输入密码后，在移开!"); }
</script>
</head>
<body>
<form>
用户:<input name="username" type="text" value="请输入用户名！" >
密码:<input name="password" type="text" value="请输入密码！" onblur="message()">
</form>
</body>
</html>
2018-07-26 查看完整代码
6-5 光标聚焦事件（onfocus）
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title> 光标聚焦事件 </title>
<script type="text/javascript">
function message(){
alert("请选择，您现在的职业！");
}
</script>
</head>
<body>
请选择您的职业：<br>
<form>
<select name="career" onfocus="message()">
<option>学生</option>
<option>教师</option>
<option>工程师</option>
<option>演员</option>
<option>会计</option>
</select>
</form>
</body>
</html>
2018-07-26 查看完整代码
6-4 鼠标移开事件（onmouseout）
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>鼠标移开事件 </title>
<script type="text/javascript">
function message(){
alert("不要移开，点击后进行慕课网!"); }
</script>
</head>
<body>
<form>
<!--<input type="button" value="qqqqq" onmouseout="message()">-->
<a href="http://www.imooc.com" onmouseout="message()">点击我</a>
</form>
</body>
</html>
2018-07-26 查看完整代码
6-3 鼠标经过事件（onmouseover）
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title> 鼠标经过事件 </title>
<script type="text/javascript">
function message(){
confirm("请输入密码后，再单击确定!"); }
</script>
</head>
<body>
<form>
密码:<input name="password" type="password" >
<input name="确定" type="button" value="确定" onmouseover="message()"/>
</form>
</body>
</html>
2018-07-26 查看完整代码
3-7 二维数组
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>二维数组</title>
<script type="text/javascript">
var myarr = new Array();
for(var i=0;i<3;i++){
var myarr[i] = new Array();
for(var j=0;j<=6;j++){
myarr[i][j]=i+j;
}
}

</script>
</head>

<body>
</body>
</html>
2018-07-26 查看完整代码
9-4 区别getElementByID,getElementsByName,getElementsByTagName
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
</head>

<body>
<form>
请选择你爱好:<br>
<input type="checkbox" name="hobby" id="hobby1"> 音乐
<input type="checkbox" name="hobby" id="hobby2"> 登山
<input type="checkbox" name="hobby" id="hobby3"> 游泳
<input type="checkbox" name="hobby" id="hobby4"> 阅读
<input type="checkbox" name="hobby" id="hobby5"> 打球
<input type="checkbox" name="hobby" id="hobby6"> 跑步 <br>
<input type="button" value = "全选" onclick = "checkall();">
<input type="button" value = "全不选" onclick = "clearall();">
<p>请输入您要选择爱好的序号，序号为1-6:</p>
<input id="wb" name="wb" type="text" >
<input name="ok" type="button" value="确定" onclick = "checkone();">
</form>
<script type="text/javascript">
function checkall(){
var hobby = document.getElementsByTagName("input");
//alert(hobby.length);
for(i=0;i<hobby.length;i++){
if(hobby[i].type=="checkbox"){
hobby[i].checked=true;
}
}

}
function clearall(){
var hobby = document.getElementsByName("hobby");

for(i=0;i<hobby.length;i++){
hobby[i].checked=false;
}

}

function checkone(){
var j=document.getElementById("wb").value;
var hobby = document.getElementById("hobby"+j);
hobby.checked=true;


}

</script>
</body>
</html>
2018-07-24 查看完整代码
9-12 插入节点appendChild()
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<body>

<ul id="test">
<li>JavaScript</li>
<li>HTML</li>
</ul>

<script type="text/javascript">

var otest = document.getElementById("test");
var newnode = document.createElement("li");
var newtext= document.createTextNode("PHP");
newnode.appendChild(newtext);
otest.appendChild(newnode);

</script>

</body>
</html>
2018-07-12 查看完整代码
9-11 访问兄弟节点
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>nextSibling</title>
</head>
<body>
<ul id="u1">
<li id="a">javascript</li>
<li id="b">jquery</li>
<li id="c">html</li>
</ul>
<ul id="u2">
<li id="d">css3</li>
<li id="e">php</li>
<li id="f">java</li>
</ul>
<script type="text/javascript">
function get_nextSibling(n){
var x=n.nextSibling;
while (x && x.nodeType!=1){
x=x.nextSibling;
}
return x;
}

var x=document.getElementsByTagName("li")[0];
document.write(x.nodeName);
document.write(" = ");
document.write(x.innerHTML);

var y=get_nextSibling(x);

if(y!=null){
document.write("<br />nextsibling: ");
document.write(y.nodeName);
document.write(" = ");
document.write(y.innerHTML);
}else{
document.write("<br>已经是最后一个节点");
}

</script>
</body>
</html>
2018-07-12 查看完整代码
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