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MaterialDesign使用 | ||
=== | ||
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`Material Design`是`Google`在`2014`年的`I/O`大会上推出的全新设计语言。 | ||
`Material Design`是基于`Android 5.0``(API level 21)`的,兼容5.0以下的设备时需要使用版本号`v21.0.0`以上的 | ||
`support v7`包中的`appcpmpat`,不过遗憾的是`support`包只支持`Material Design`的部分特性。 | ||
使用`eclipse`或`Android Studio`进行开发时,直接在`Android SDK Manager`中将`Extras->Android Support Library` | ||
升级至最新版即可。 | ||
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--- | ||
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- 邮箱 :[email protected] | ||
- Good Luck! |
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DOM | ||
=== | ||
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`DOM`(Document Object Model)文档对象模型 | ||
当网页被加载时,浏览器会创建页面的文档对象模型。 | ||
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通过对象模型,`JavaScript`获得了足够的能力来创建动态的`HTML`。 | ||
- `JavaScript`能够改变页面中的所有`HTML`元素 | ||
- `JavaScript`能够改变页面中的所有`HTML`属性 | ||
- `JavaScript`能够改变页面中的所有`CSS`样式 | ||
- `JavaScript`能够对页面中的所有事件做出反应 | ||
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- 查找HTML元素 | ||
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为了做到这件事情,您必须首先找到该元素。有三种方法来做这件事: | ||
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- 通过`id`找到`HTML`元素 | ||
- 通过标签名找到`HTML`元素 | ||
- 通过类名找到`HTML`元素 | ||
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- 通过`id查找`HTML`元素 | ||
``` | ||
<!DOCTYPE html> | ||
<html> | ||
<body> | ||
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<p id="intro">Hello World!</p> | ||
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<script> | ||
x=document.getElementById("intro"); | ||
document.write('<p>id="intro" 的段落中的文本是:' + x.innerHTML + '</p>'); | ||
</script> | ||
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</body> | ||
</html> | ||
``` | ||
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- 通过标签名查找`HTML`元素 | ||
``` | ||
<div id="main"> | ||
<p>The DOM is very useful.</p> | ||
</div> | ||
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<script> | ||
var x=document.getElementById("main"); | ||
var y=x.getElementsByTagName("p"); | ||
document.write('id 为 "main" 的 div 中的第一段文本是:' + y[0].innerHTML); | ||
</script> | ||
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</body> | ||
</html> | ||
``` | ||
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- 向HTML输出内容 | ||
`document.write()` | ||
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``` | ||
<!DOCTYPE html> | ||
<html> | ||
<body> | ||
<script> | ||
document.write(Date()); | ||
</script> | ||
</body> | ||
</html> | ||
``` | ||
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- 修改HTML内容 | ||
修改`HTML`内容的最简单的方法时使用`innerHTML`属性。 | ||
``` | ||
<!DOCTYPE html> | ||
<html> | ||
<body> | ||
<h1 id="header">Old Header</h1> | ||
<script> | ||
var element=document.getElementById("header"); | ||
element.innerHTML="New Header"; | ||
</script> | ||
</body> | ||
</html> | ||
``` | ||
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- 改变HTML属性 | ||
使用`属性名`来获取`HTML`元素的属性 | ||
例如改变`<img>`元素的`src`属性: | ||
``` | ||
<!DOCTYPE html> | ||
<html> | ||
<body> | ||
<img id="image" src="smiley.gif"> | ||
<script> | ||
document.getElementById("image").src="landscape.jpg"; | ||
</script> | ||
</body> | ||
</html> | ||
``` | ||
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- 改变HTML样式 | ||
通过`.style.属性名`来获取元素样式,例如下面的改变文字颜色值: | ||
``` | ||
<p id="p2">Hello World!</p> | ||
<script> | ||
document.getElementById("p2").style.color="blue"; | ||
</script> | ||
``` | ||
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- 响应事件 | ||
通过对当前元素设置`onclick`属性.例如下面这个请点击该文本的文字,当我们点击时,文字就会变成谢谢。 | ||
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``` | ||
<!DOCTYPE html> | ||
<html> | ||
<body> | ||
<h1 onclick="this.innerHTML='谢谢!'">请点击该文本</h1> | ||
</body> | ||
</html> | ||
``` | ||
或 | ||
``` | ||
<!DOCTYPE html> | ||
<html> | ||
<head> | ||
<script> | ||
function changetext(id) | ||
{ | ||
id.innerHTML="谢谢!"; | ||
} | ||
</script> | ||
</head> | ||
<body> | ||
<h1 onclick="changetext(this)">请点击该文本</h1> | ||
</body> | ||
</html> | ||
``` | ||
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- Button | ||
``` | ||
<button onclick="displayDate()">点击这里</button> | ||
``` | ||
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或者 | ||
``` | ||
<!DOCTYPE html> | ||
<html> | ||
<head> | ||
</head> | ||
<body> | ||
<p>点击按钮就可以执行 <em>displayDate()</em> 函数。</p> | ||
<button id="myBtn">点击这里</button> | ||
<script> | ||
document.getElementById("myBtn").onclick=function(){displayDate()}; | ||
function displayDate() | ||
{ | ||
document.getElementById("demo").innerHTML=Date(); | ||
} | ||
</script> | ||
<p id="demo"></p> | ||
</body> | ||
</html> | ||
``` | ||
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- 创建和删除节点 | ||
``` | ||
<!DOCTYPE html> | ||
<html> | ||
<body> | ||
<div id="div1"> | ||
<p id="p1">这是一个段落。</p> | ||
<p id="p2">这是另一个段落。</p> | ||
</div> | ||
<script> | ||
var para=document.createElement("p"); | ||
var node=document.createTextNode("这是新段落。"); | ||
para.appendChild(node); | ||
var element=document.getElementById("div1"); | ||
element.appendChild(para); | ||
</script> | ||
</body> | ||
</html> | ||
``` | ||
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- 删除节点 | ||
``` | ||
<!DOCTYPE html> | ||
<html> | ||
<body> | ||
<div id="div1"> | ||
<p id="p1">这是一个段落。</p> | ||
<p id="p2">这是另一个段落。</p> | ||
</div> | ||
<script> | ||
var parent=document.getElementById("div1"); | ||
var child=document.getElementById("p1"); | ||
parent.removeChild(child); | ||
</script> | ||
</body> | ||
</html> | ||
``` | ||
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--- | ||
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- 邮箱 :[email protected] | ||
- Good Luck! | ||
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