2018-02-01 22:58:37 +08:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
## 动态创建DOM元素的三种方式
|
|
|
|
|
|
|
|
|
|
|
|
- `document.write();` 不常用，因为容易覆盖原来的页面。
|
|
|
|
|
|
|
2018-02-06 14:18:23 +08:00
|
|
|
|
- `innerHTML = ();` 用的比较多。绑定属性和内容比较方便。(节点套节点)
|
2018-02-01 22:58:37 +08:00
|
|
|
|
|
2018-02-06 14:18:23 +08:00
|
|
|
|
- `document.createElement();` 用得也比较多，指定数量的时候一般用它。
|
2018-02-01 22:58:37 +08:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
**1、方式一：**
|
|
|
|
|
|
|
|
|
|
|
|
```javascript
|
|
|
|
|
|
document.write();
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
这种方式的好处是：比较随意，想创建就创建，可以直接在`write`里写属性都行。但是会把原来的标签给覆盖掉。所以不建议。
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
举例：
|
|
|
|
|
|
|
|
|
|
|
|
```html
|
|
|
|
|
|
<!DOCTYPE html>
|
|
|
|
|
|
<html lang="en">
|
|
|
|
|
|
<head>
|
|
|
|
|
|
<meta charset="UTF-8">
|
|
|
|
|
|
<title>Title</title>
|
|
|
|
|
|
</head>
|
|
|
|
|
|
<body>
|
|
|
|
|
|
<ul>
|
|
|
|
|
|
smyhvae
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
|
|
<script>
|
|
|
|
|
|
//第一种创建方式：document.write();
|
|
|
|
|
|
document.write("<li class='hehe'>我是document.write创建的</li>");
|
|
|
|
|
|
</script>
|
|
|
|
|
|
</body>
|
|
|
|
|
|
</html>
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
效果如下：
|
|
|
|
|
|
|
2018-02-02 21:19:12 +08:00
|
|
|
|
|
2018-02-01 22:58:37 +08:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
**方式二：**innerHTML
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
举例如下：
|
|
|
|
|
|
|
|
|
|
|
|
```html
|
|
|
|
|
|
<!DOCTYPE html>
|
|
|
|
|
|
<html lang="en">
|
|
|
|
|
|
<head>
|
|
|
|
|
|
<meta charset="UTF-8">
|
|
|
|
|
|
<title>Title</title>
|
|
|
|
|
|
</head>
|
|
|
|
|
|
<body>
|
|
|
|
|
|
<ul>
|
|
|
|
|
|
smyhvae
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
|
|
<script>
|
|
|
|
|
|
var ul = document.getElementsByTagName("ul")[0];
|
|
|
|
|
|
|
|
|
|
|
|
//第二种：直接利用元素的innerHTNL方法。（innerText方法不识别标签）
|
|
|
|
|
|
ul.innerHTML += "<li id='li1'>我是innerHTML创建的</li>" //注意，是用符号“+=”，不是“=”
|
|
|
|
|
|
</script>
|
|
|
|
|
|
</body>
|
|
|
|
|
|
</html>
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
注意，上方代码中，是用是用符号`+=`，不是`=`，前者是在原来的基础之上增加，后者是替换。
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
效果如下：
|
|
|
|
|
|
|
2018-02-02 21:19:12 +08:00
|
|
|
|
|
2018-02-01 22:58:37 +08:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
**3、方式三：**利用DOM的api创建
|
|
|
|
|
|
|
|
|
|
|
|
利用DOM的api创建节点，有很多种：
|
|
|
|
|
|
|
|
|
|
|
|
比如：
|
|
|
|
|
|
|
|
|
|
|
|
- createElement()
|
|
|
|
|
|
|
|
|
|
|
|
- appendChild()
|
|
|
|
|
|
|
|
|
|
|
|
- removeChild()
|
|
|
|
|
|
|
|
|
|
|
|
- insertBefore()
|
|
|
|
|
|
|
|
|
|
|
|
- replaceChild()
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
这个我们在上一篇文章的`DOM节点的操作`这一段中已经讲到了。
|
|
|
|
|
|
|
|
|
|
|
|
```html
|
|
|
|
|
|
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
## innerHTML举例：在线用户的获取
|
|
|
|
|
|
|
|
|
|
|
|
现在要做下面这样一个页面：
|
|
|
|
|
|
|
2018-02-02 21:19:12 +08:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2018-02-01 22:58:37 +08:00
|
|
|
|
|
|
|
|
|
|
上图的意思是，每次刷新页面，都从服务器获取最新的在线人数的名单（我们先用本地的数组来模拟服务器上的数据）。
|
|
|
|
|
|
|
|
|
|
|
|
它的结构是：div > ul > li。每一个li就是一个头像。
|
|
|
|
|
|
|
|
|
|
|
|
如果在本地直接添加几个头像的话，代码是：
|
|
|
|
|
|
|
|
|
|
|
|
```html
|
|
|
|
|
|
//往ul中添加li元素以及li元素中的内容
|
|
|
|
|
|
ul.innerHTML += '<li>'+
|
|
|
|
|
|
'<a href="#" target="_blank"><img src="images/noavatar_small.gif" width="48" height="48" alt="生命壹号"></a>'+
|
|
|
|
|
|
'<p><a href="#" title="生命壹号" target="_blank">生命壹号</a></p>'+
|
|
|
|
|
|
'</li>';
|
|
|
|
|
|
ul.innerHTML += '<li>'+
|
|
|
|
|
|
'<a href="#" target="_blank"><img src="images/noavatar_small.gif" width="48" height="48" alt="生命壹号"></a>'+
|
|
|
|
|
|
'<p><a href="#" title="生命壹号" target="_blank">生命壹号</a></p>'+
|
|
|
|
|
|
'</li>';
|
|
|
|
|
|
ul.innerHTML += '<li>'+
|
|
|
|
|
|
'<a href="#" target="_blank"><img src="images/noavatar_small.gif" width="48" height="48" alt="生命壹号"></a>'+
|
|
|
|
|
|
'<p><a href="#" title="生命壹号" target="_blank">生命壹号</a></p>'+
|
|
|
|
|
|
'</li>';
|
|
|
|
|
|
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
上方代码有两点比较重要：
|
|
|
|
|
|
|
|
|
|
|
|
- 我们是通过`ul.innerHTML += 元素节点`的方式来不停地往ul里面加内容，比`createElement`的方式要方便。
|
|
|
|
|
|
|
|
|
|
|
|
- 元素的内容本身有双引号`"`，所以我们要用单引号`'`进行字符串的连接。
|
|
|
|
|
|
|
|
|
|
|
|
但是，当我们从服务器获取在线用户的时候，头像和用户的昵称是动态变化的，所以每个字符串要用变量进行表示：
|
|
|
|
|
|
|
|
|
|
|
|
```html
|
|
|
|
|
|
ul.innerHTML += '<li>'+
|
|
|
|
|
|
'<a href="#" target="blank"><img src="'+users[i].icon+'" width="48" height="48" alt="'+users[i].name+'"></a>'+
|
|
|
|
|
|
'<p><a href="#" title="'+users[i].name+'" target="_blank">'+users[i].name+'</a></p>'+
|
|
|
|
|
|
'</li>';
|
|
|
|
|
|
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
这里我们暂时用本地的数组来代表服务器的数据，最终的完整版代码如下：
|
|
|
|
|
|
|
|
|
|
|
|
```html
|
|
|
|
|
|
<!DOCTYPE html>
|
|
|
|
|
|
<html>
|
|
|
|
|
|
<head lang="en">
|
|
|
|
|
|
<meta charset="UTF-8">
|
|
|
|
|
|
<title></title>
|
|
|
|
|
|
<style>
|
|
|
|
|
|
* {
|
|
|
|
|
|
word-wrap: break-word;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.wp {
|
|
|
|
|
|
width: 730px;
|
|
|
|
|
|
margin: 0px auto;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.mtn {
|
|
|
|
|
|
margin-top: 5px !important;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
#ct .frame {
|
|
|
|
|
|
margin: 0;
|
|
|
|
|
|
border: none;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.xfs_2 .frame-title, .xfs_2 .frametitle, .xfs_2 .tab-title {
|
|
|
|
|
|
background-color: #A90000;
|
|
|
|
|
|
background-position: 0 -99px;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.xfs .frame-title, .xfs .frametitle, .xfs .tab-title, .xfs .frame-title a, .xfs .frametitle a, .xfs .tab-title a {
|
|
|
|
|
|
color: #FFF !important;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.xfs .frame-title, .xfs .frametitle, .xfs .tab-title {
|
|
|
|
|
|
border: none;
|
|
|
|
|
|
background: transparent url(images/mu.png) repeat-x 0 95;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.title {
|
|
|
|
|
|
padding: 0 10px;
|
|
|
|
|
|
height: 32px;
|
|
|
|
|
|
font-size: 14px;
|
|
|
|
|
|
font-weight: 700;
|
|
|
|
|
|
line-height: 32px;
|
|
|
|
|
|
overflow: hidden;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.block {
|
|
|
|
|
|
margin: 10px 10px 0;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
ul, menu, dir {
|
|
|
|
|
|
display: block;
|
|
|
|
|
|
list-style: none;
|
|
|
|
|
|
-webkit-margin-before: 1em;
|
|
|
|
|
|
-webkit-margin-after: 1em;
|
|
|
|
|
|
-webkit-margin-start: 0px;
|
|
|
|
|
|
-webkit-margin-end: 0px;
|
|
|
|
|
|
-webkit-padding-start: 25px;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.mls li {
|
|
|
|
|
|
padding: 0 0 5px;
|
|
|
|
|
|
width: 66px;
|
|
|
|
|
|
height: 85px;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.ml li {
|
|
|
|
|
|
float: left;
|
|
|
|
|
|
text-align: center;
|
|
|
|
|
|
overflow: hidden;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
a {
|
|
|
|
|
|
color: #333;
|
|
|
|
|
|
text-decoration: none;
|
|
|
|
|
|
font: 12px/1.5 Tahoma, 'Microsoft Yahei', 'Simsun';
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.mls p {
|
|
|
|
|
|
margin-top: 5px;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.ml p, .ml span {
|
|
|
|
|
|
display: block;
|
|
|
|
|
|
width: 100%;
|
|
|
|
|
|
height: 20px;
|
|
|
|
|
|
white-space: nowrap;
|
|
|
|
|
|
text-overflow: ellipsis;
|
|
|
|
|
|
overflow: hidden;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.mls img {
|
|
|
|
|
|
width: 48px;
|
|
|
|
|
|
height: 48px;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.ml img {
|
|
|
|
|
|
display: block;
|
|
|
|
|
|
margin: 0 auto;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
a img {
|
|
|
|
|
|
border: none;
|
|
|
|
|
|
}
|
|
|
|
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
|
|
<body>
|
|
|
|
|
|
|
|
|
|
|
|
<div class="wp mtn">
|
|
|
|
|
|
<div id="diy3" class="area">
|
|
|
|
|
|
<div id="frameipq7f2" class="xfs xfs_2 frame move-span cl frame-1">
|
|
|
|
|
|
<div
|
|
|
|
|
|
class="title frame-title"><span class="titletext">当前在线用户</span></div>
|
|
|
|
|
|
<div id="frameipq7f2_left"
|
|
|
|
|
|
class="column frame-1-c">
|
|
|
|
|
|
<div
|
|
|
|
|
|
id="frameipq7f2_left_temp" class="move-span temp"></div>
|
|
|
|
|
|
<div id="portal_block_695"
|
|
|
|
|
|
class="block move-span">
|
|
|
|
|
|
<div
|
|
|
|
|
|
id="portal_block_695_content" class="dxb_bc">
|
|
|
|
|
|
<div class="module cl ml mls" id="users">
|
|
|
|
|
|
<ul>
|
|
|
|
|
|
<!--<li>-->
|
|
|
|
|
|
<!--<a href="#" target="_blank"><img src="images/noavatar_small.gif" width="48" height="48" alt="生命壹号"></a>-->
|
|
|
|
|
|
<!--<p><a href="#" title="生命壹号" target="_blank">生命壹号</a></p>-->
|
|
|
|
|
|
<!--</li>-->
|
|
|
|
|
|
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<script>
|
|
|
|
|
|
//模拟从服务器获取数据
|
|
|
|
|
|
var users = [
|
|
|
|
|
|
{"name": "smyhvae", "icon": "images/noavatar_small.gif"},
|
|
|
|
|
|
{"name": "smyh", "icon": "images/noavatar_small.gif"},
|
|
|
|
|
|
{"name": "smyh02", "icon": "images/75_avatar_small.jpg"},
|
|
|
|
|
|
{"name": "vae", "icon": "images/89_avatar_small.jpg"},
|
|
|
|
|
|
{"name": "today", "icon": "images/noavatar_small.gif"},
|
|
|
|
|
|
{"name": "enen", "icon": "images/noavatar_small.gif"},
|
|
|
|
|
|
{"name": "oyey", "icon": "images/noavatar_small.gif"},
|
|
|
|
|
|
{"name": "dongxiaojie", "icon": "images/noavatar_small.gif"},
|
|
|
|
|
|
{"name": "qishi", "icon": "images/noavatar_small.gif"},
|
|
|
|
|
|
{"name": "qqtang", "icon": "images/noavatar_small.gif"},
|
|
|
|
|
|
{"name": "wawawa", "icon": "images/noavatar_small.gif"},
|
|
|
|
|
|
{"name": "haha", "icon": "images/noavatar_small.gif"},
|
|
|
|
|
|
{"name": "robot", "icon": "images/noavatar_small.gif"},
|
|
|
|
|
|
{"name": "heheda", "icon": "images/noavatar_small.gif"},
|
|
|
|
|
|
{"name": "smyhvae1", "icon": "images/noavatar_small.gif"},
|
|
|
|
|
|
{"name": "lihaile", "icon": "images/noavatar_small.gif"}
|
|
|
|
|
|
];
|
|
|
|
|
|
|
|
|
|
|
|
//需求：页面显示所有的在线用户。
|
|
|
|
|
|
//思路：模拟服务器获取数据（数组中装着json）.获取ul，把ul的innerHTML属性获取到，然后不间断的往innerHTML属性中赋值。
|
|
|
|
|
|
//赋值要求：li标签的内容。
|
|
|
|
|
|
//步骤：(获取元素)
|
|
|
|
|
|
var div = document.getElementById("users");
|
|
|
|
|
|
var ul = div.firstElementChild || div.firstChild;
|
|
|
|
|
|
// var ul = div.children[0];
|
|
|
|
|
|
|
|
|
|
|
|
//1.模拟服务器获取数据（定义数组），通过循环添加元素（定义for）
|
|
|
|
|
|
//数组中有多少元素，我们就创建多少个li标签
|
|
|
|
|
|
for (var i = 0; i < users.length; i++) {
|
|
|
|
|
|
//2.模拟实验的操作方式。
|
|
|
|
|
|
ul.innerHTML += '<li>' +
|
|
|
|
|
|
'<a href="#" target="blank"><img src="' + users[i].icon + '" width="48" height="48" alt="' + users[i].name + '"></a>' +
|
|
|
|
|
|
'<p><a href="#" title="' + users[i].name + '" target="_blank">' + users[i].name + '</a></p>' +
|
|
|
|
|
|
'</li>';
|
|
|
|
|
|
}
|
|
|
|
|
|
</script>
|
|
|
|
|
|
</body>
|
|
|
|
|
|
</html>
|
|
|
|
|
|
```
|
|
|
|
|
|
|
2018-02-02 21:19:12 +08:00
|
|
|
|
工程文件：
|
|
|
|
|
|
|
|
|
|
|
|
- [2018-02-01-获取在线用户列表demo.rar](http://download.csdn.net/download/smyhvae/10237611)
|
|
|
|
|
|
|
|
|
|
|
|
|
2018-02-01 22:58:37 +08:00
|
|
|
|
|
|
|
|
|
|
## innerHTML举例2：模拟百度搜索的下方提示
|
|
|
|
|
|
|
|
|
|
|
|
要求实现的效果如下：
|
|
|
|
|
|
|
2018-02-02 21:19:12 +08:00
|
|
|
|
|
2018-02-01 22:58:37 +08:00
|
|
|
|
|
|
|
|
|
|
在这之前，我们先实现这样一个例子：**判断字符串以某个字符串为开头**。
|
|
|
|
|
|
|
|
|
|
|
|
**判断字符串是否以某个字符串为开头：**
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
```javascript
|
|
|
|
|
|
var str = "smyhvae";
|
|
|
|
|
|
|
|
|
|
|
|
//判断str是否以sm为开头？（给定字符串，然后他的索引值为0）
|
|
|
|
|
|
var num = str.indexOf("sm");
|
|
|
|
|
|
//只有返回值为0，那么字符串才是以参数为开头
|
|
|
|
|
|
//如果在任何位置都查询不到参数，则返回值为-1；
|
|
|
|
|
|
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
代码解释：我们可以通过`indexOf("参数")`来实现。如果返回的索引值为0，说明字符串就是以这个参数开头的。
|
|
|
|
|
|
|
|
|
|
|
|
为了实现上方gif图的搜索功能，完整版代码如下：
|
|
|
|
|
|
|
|
|
|
|
|
```html
|
|
|
|
|
|
<!DOCTYPE html>
|
|
|
|
|
|
<html>
|
|
|
|
|
|
<head lang="en">
|
|
|
|
|
|
<meta charset="UTF-8">
|
|
|
|
|
|
<title></title>
|
|
|
|
|
|
<style>
|
|
|
|
|
|
* {
|
|
|
|
|
|
padding: 0;
|
|
|
|
|
|
margin: 0;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.box {
|
|
|
|
|
|
width: 500px;
|
|
|
|
|
|
margin: 200px auto;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
ul {
|
|
|
|
|
|
width: 392px;
|
|
|
|
|
|
padding: 5px;
|
|
|
|
|
|
list-style: none;
|
|
|
|
|
|
border: 1px solid red;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
li:hover {
|
|
|
|
|
|
background-color: red;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
input {
|
|
|
|
|
|
width: 400px;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
button {
|
|
|
|
|
|
width: 70px;
|
|
|
|
|
|
}
|
|
|
|
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
|
|
<body>
|
|
|
|
|
|
<div class="box">
|
|
|
|
|
|
<input type="text"/>
|
|
|
|
|
|
<button>搜索</button>
|
|
|
|
|
|
<!--<ul>-->
|
|
|
|
|
|
<!--<li>aaaa</li>-->
|
|
|
|
|
|
<!--<li>bbb</li>-->
|
|
|
|
|
|
<!--<li>ccc</li>-->
|
|
|
|
|
|
<!--</ul>-->
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<script>
|
|
|
|
|
|
//需求：输入内容(输入事件，键盘弹起事件)，模拟服务器获取内容，创建ul，并在其中显示。
|
|
|
|
|
|
|
|
|
|
|
|
//1.获取事件源
|
|
|
|
|
|
//模拟服务器获取内容
|
|
|
|
|
|
var arr = ["a", "ab", "abc", "abcd", "aa", "aaa"];
|
|
|
|
|
|
var box = document.getElementsByTagName("div")[0];
|
|
|
|
|
|
var inp = box.children[0];
|
|
|
|
|
|
// var inp = document.getElementsByTagName("input")[0];
|
|
|
|
|
|
|
|
|
|
|
|
//2.绑定事件(输入内容(输入事件，键盘弹起事件))
|
|
|
|
|
|
inp.onkeyup = function () {
|
|
|
|
|
|
//创建一个字符串，里面添加满了li和对应的内容。
|
|
|
|
|
|
var newArr = [];
|
|
|
|
|
|
//遍历老数组arr，然后判断每一项，只要是以input的内容为开头的，就添加到新数组newArr中，然后转成字符串。
|
|
|
|
|
|
for (var i = 0; i < arr.length; i++) {
|
|
|
|
|
|
|
|
|
|
|
|
//获取输入内容input标签的value属性值。
|
|
|
|
|
|
if (arr[i].indexOf(this.value) === 0) { //【重要】判断老数组arr中的每一项，是否以input的内容为开头
|
|
|
|
|
|
newArr.push("<li>" + arr[i] + "</li>");
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
var str = newArr.join("");
|
|
|
|
|
|
|
|
|
|
|
|
//Bug1：每次创建新的ul之前，如果有就的ul，就先删除旧的ul
|
|
|
|
|
|
if (box.getElementsByTagName("ul")[0]) {
|
|
|
|
|
|
//只要存在，那么就是object，object类型的数据，只要不是null,对应的boolean值都是true；
|
|
|
|
|
|
box.removeChild(box.children[2]);
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
//Bug2.如果input的内容为空，那么就不能再生成ul了。
|
|
|
|
|
|
//如果input为空，那就切断函数
|
|
|
|
|
|
|
|
|
|
|
|
//Bug3.如果arr数组中找不到以input为开头的元素。那就切断函数
|
|
|
|
|
|
//newArr的长度为0，就能证明以input内容为开头的元素，在arr中不存在
|
|
|
|
|
|
if (this.value.length === 0 || newArr.length === 0) { //fix bug2、fix bug3
|
|
|
|
|
|
//切断函数，直接return
|
|
|
|
|
|
return;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
//3.书写事件驱动程序
|
|
|
|
|
|
var ul = document.createElement("ul");
|
|
|
|
|
|
//把创建好的内容添加到ul中。
|
|
|
|
|
|
ul.innerHTML = str;
|
|
|
|
|
|
box.appendChild(ul);
|
|
|
|
|
|
}
|
|
|
|
|
|
</script>
|
|
|
|
|
|
</body>
|
|
|
|
|
|
</html>
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
## 动态操作表格
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
方式1：
|
|
|
|
|
|
|
|
|
|
|
|
```
|
|
|
|
|
|
createElement()
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
方式2：
|
|
|
|
|
|
|
|
|
|
|
|
- rows (只读，table和textarea能用)
|
|
|
|
|
|
|
|
|
|
|
|
- insertRow() (只有table能调用)
|
|
|
|
|
|
|
|
|
|
|
|
- deleteRow() (只有table能调用)
|
|
|
|
|
|
|
|
|
|
|
|
- cells (只读，table和textarea能用)
|
|
|
|
|
|
|
|
|
|
|
|
- insertCell() (只有tr能调用)
|
|
|
|
|
|
|
|
|
|
|
|
- deleteCell() (只有tr能调用)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
PS：括号里可以带index。用的不多。
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
