JS 获取元素

2017-08-22 17:23:48 Albin Wong 1459

## 获取元素
```
<style type="text/css">
*{
    /*padding:0px;
    margin:0px;*/
    list-style:none;
    text-decoration:none;
    font-family:microsoft yahei;
}
#all{
    padding:10px;
    width:800px;
    height:auto;
    border:solid 1px #333;
    margin:0 auto;
    
}
#menu a{font-size:14px;}
#header{width:97%;height:80px;border:solid 1px #444;margin:10px;}
#section{width:97%;height:auto;border:solid 1px #444;margin:10px;}

#footer{width:97%;height:50px;border:solid 1px #444;margin:10px;}
#header ul{height:auto;overflow:hidden;padding-left:100px;}
#header ul li{width:60px;height:30px;float:left;border:solid 1px #456;text-align:center;line-height:30px;}

#logo{width:200px;height:auto;float:left;position:relative;}
#logo img{margin-top:-40px;}
#section ul{height:auto;overflow:hidden;padding:20px;}
#section li{width:200px;height:150px;float:left;border:solid 2px pink;padding:10px;margin-right:21px;margin-bottom:21px;}
#img{width:100px;float:left;}
#copy{height:auto;overflow:hidden;padding-left:100px;}
#move{width:80px;height:40px;background:pink;position:fixed;right:0px;top:100px;cursor:pointer;font-family:courier;line-height:40px;}
#allmove{width:80px;height:40px;background:pink;position:fixed;right:0px;top:200px;cursor:pointer;font-family:courier;line-height:40px;}
#recovery{width:80px;height:40px;background:pink;position:fixed;right:0px;top:300px;cursor:pointer;font-family:courier;line-height:40px;}
</style>
<script type="text/javascript">
    window.onload = function(){
        var lis = images.getElementsByTagName('li');//获取所有的li
        for(var i=0;i<lis.length;i++){       
            lis[i].style.transform = 'rotate('+(Math.ceil(Math.random()*90)-45)+'deg)';
        }

move.onclick = function(){
            for(var i=0;i<lis.length;i++){      
                lis[i].style.transform = 'rotate('+(Math.ceil(Math.random()*90)-45)+'deg)';
            }
            return false;
        }
        allmove.onclick = function(){
            var d = 0;
            var inte = setInterval(function(){
                document.body.style.transform = 'rotate('+d+'deg)';
                d+=10;
                if(d > 360){
                    clearInterval(inte);
                }
            },10)
        }
        recovery.onclick = function(){
            for(var i=0;i<lis.length;i++){      
                lis[i].style.transform = 'rotate(0deg)';
            }
            return false;
        }
    }
</script>

<div id="all">
    
    <div id="header">
        <div id="logo"><img src="./sunli/logo.png" alt="" width="100%"></div>
        <ul id="menu">
            <li><a href="国内">国内</a></li>
            <li><a href="国外">国外</a></li>
            <li><a href="科技">科技</a></li>
            <li><a href="生活">生活</a></li>
        </ul>
    </div>
    
    <div>123678<span>iloveyou</span></div>
    
    <div id="section">
        <ul id="images">
            <li class="w"><a href=""><img src="./sunli/1.jpg" alt="" width="100%"></a></li>
            <li class="w"><a href=""><img src="./sunli/2.jpg" alt="" width="100%"></a></li>
            <li class="w"><a href=""><img src="./sunli/3.jpg" alt="" width="100%"></a></li>
            <li><a href=""><img src="./sunli/4.jpg" alt="" width="100%"></a></li>
            <li id="five"><a href=""><img src="./sunli/5.jpg" alt="" width="100%"></a></li>
            <li><a href=""><img src="./sunli/6.jpg" alt="" width="100%"></a></li>
            <li name="y"><a href=""><img src="./sunli/7.jpg" alt="" width="100%"></a></li>
            <li name="y"><a href=""><img src="./sunli/8.jpg" alt="" width="100%"></a></li>
            <li name="y"><a href=""><img src="./sunli/9.jpg" alt="" width="100%"></a></li>
        </ul>
    </div>
    
        
    
    <div id="footer">
        <div id="img"><img src="./sunli/logo.png" alt="" width="100%"></div>
        <div id="copy">© Copyright 2014. All Rights Reserved.</div>
    </div>
    
    
</div>

<div id="move">Image</div>
<div id="allmove">Body</div>
<div id="recovery">Recovery</div>
```

#### 通过id来获取元素
`var logo = document.getElementById('logo');`
#### 通过标签名来获取元素  在文档中获取所有的li元素
```javascript
var lis = document.getElementsByTagName('li');
for(var i=0;i<lis.length;i++){
    lis[i].style.background = 'red';
}
```
#### 通过类名来获取元素
```javascript
var ws = document.getElementsByClassName('w');
for(var i=0;i<ws.length;i++) {
    ws[i].style.background = 'pink';
}
```

#### 通过name的值;来获取元素
```javascript
var ns = document.getElementsByName('y');
for(var i=0;i<ns.length;i++) {
    ns[i].style.background = 'red';
}
```

#### 父子关系来获取元素
##### 获取ul元素
```javascript
var ul = document.getElementById('images');
var cs = ul.childNodes;
```
##### 获取元素中的所有的标签子元素
```javascript
var css = ul.children; // 小孩子的复数
for(var i=0;i<css.length;i++) {
    css[i].style.border  = "solid 2px black";
}
```
#### 获取第一个子节点
`var f = ul.firstChild;`
#### 获取第一个标签子节点
`var first = ul.firstElementChild;`

#### 获取最后一个子节点
`var l = ul.lastChild;`
#### 获取最后一个标签子节点
`var last = ul.lastElementChild;`

#### 获取元素的上一个同辈元素
```javascript
var five = document.getElementById('five');
var prev = five.previousSibling;
```

#### 获取元素的上一个同辈标签元素
`var prev = five.previousElementSibling;`

#### 获取元素的下一个同辈元素
`var n = five.nextSibling;`
#### 获取下一个同辈的标签元素
```javascript
var next = five.nextElementSibling;
next.style.background = 'black';

five.nextElementSibling.nextElementSibling.nextElementSibling.style.background = 'red';
```

#### 获取父级节点
```javascript
var p = five.parentNode;
var pare = five.parentElement;
pare.parentNode.parentNode.parentNode.style.background = 'grey';
console.log(pare);  
```

(3) Comments

John Doe- Reply

February 26, 2013 at 1:18 pm
- saqib sarwar- Reply
  
  February 26, 2013 at 1:20 pm
  
  Nam liber tempor cum soluta nobis eleifend option congue nihil imperdiet doming id quod mazim placerat facer possim assum. Typi non habent claritatem insitam; est usus legentis in iis qui facit eorum claritatem. Investigationes demonstraverunt lectores legere me lius quod ii legunt saepius. Claritas est etiam processus dynamicus, qui sequitur mutationem consuetudium lectorum. Mirum est notare quam littera gothica, quam nunc putamus parum claram, anteposuerit litterarum formas humanitatis per seacula quarta decima et quinta decima. Eodem modo typi, qui nunc nobis videntur parum clari, fiant sollemnes in futurum.
John Doe- Reply

February 26, 2013 at 1:27 pm

Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat.

Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi. Nam liber tempor cum soluta nobis eleifend option congue nihil imperdiet doming id quod mazim placerat facer possim assum.

Your email address will not be published. Required fields are marked *

Name *

Email *

Website

Comment

You can use these HTML tags and attributes <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>

JS 获取元素

(3) Comments

John Doe- Reply

saqib sarwar- Reply

John Doe- Reply

Leave a Reply