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HTML之JS学习

2016-11-17 00:01 162 查看

提示篇

function fun(){
var is = confirm('选择对话框');/*确定取消对话框*/
if(is == true){
document.write('真');/*网页输出字符*/
}else{
document.write('假');
}

var name = prompt('请输入内容',"占位符");
document.write(name);
}
/*
alert  confirm  prompt
*/

原型

<script>
//原型：类似于iOS里面的类目
function Person() {//定义类
this.Age = 10;
}
var p1 = new Person();
//访问原型
p1.__proto__.Title = '123';//为原型注释数据成员
Person.prototype.Name = '刘冠';

var p2 = new Person()
alert(p2.Age+'\n'+p2.Title+'\n'+p2.Name)

</script>

跑马灯测试

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<meta charset="utf-8" />
<style>
#id {
position:absolute;
border:1px solid red;
background-color:blue;
color:white;
width:100px;
}
</style>
<script>
var left = 0;
var direction = 1;
function run() {
left += 10*direction;
if (left + 100 >= window.innerWidth) {
direction = -1;
}
if (left <= 0) {
direction = 1;
}
var temp = document.getElementById('id');
temp.style.left = left + 'px';
}

onload = function () {
setInterval(run, 100);
}
</script>
</head>
<body>
<div id="id">跑马灯</div>
</body>
</html>

动态标签（与XML类似）

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<meta charset="utf-8" />
<script>
onload = function () {
document.getElementById('butImage').onclick = function () {
var img = document.createElement('img');
img.src = 'IMG_0457.JPG';
document.getElementById('divContainer').appendChild(img);
}
document.getElementById('butSrc').onclick = function () {
var a = document.createElement('a');
a.href = 'http://www.baidu.com';
a.innerText = '百度';
document.getElementById('divContainer').appendChild(a);
}
document.getElementById('clear').onclick = function () {
var nodes = document.getElementById('divContainer').childNodes;
for (var i = nodes.length-1; i > 0; i--) {
document.getElementById('divContainer').removeChild(nodes[i]);
}
}
}
</script>
</head>
<body>
<input type="button" id="butImage" value="图片" />
<input type="button" id="butText" value="文本框" />
<input type="button" id="butSrc" value="超链接" />
<input type="button" id="clear" value="删除" />
<div id="divContainer">

</div>
</body>
</html>

模仿五星好评

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<meta charset="utf-8" />
<script>
onload = function () {
var number = -1;
var images = document.getElementsByTagName('img');
for (var i = 0; i < images.length; i++) {
//光标放上去
images[i].onmouseover = function () {
//将之前的图片变黄，之后的图片变灰
var id = this.id;
for (var i = 0; i < images.length; i++) {
if (i <= id) {
images[i].src = "images/star2.png";
}else{
images[i].src = "images/star1.png";
}
}
}
//光标移开
images[i].onmouseout = function () {
for (var i = 0; i < images.length; i++) {
if (i <= number) {
images[i].src = "images/star2.png";
} else {
images[i].src = "images/star1.png";
}
}
number = -1;
}
//点击
images[i].onmousedown = function () {
number = parseInt(this.id);
document.getElementById('text').innerText = this.id;
}
}
}
</script>
</head>
<body>
<img id="0" src="images/star1.png" />
<img id="1" src="images/star1.png" />
<img id="2" src="images/star1.png" />
<img id="3" src="images/star1.png" />
<img id="4" src="images/star1.png" />
<div id="text"></div>
</body>
</html>

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