Encapsulate a method in js - modularization
Modularization is to encapsulate a method in each js: use exports to output it, and the method will be output when the next js loads the js using the require method. Then introduce require.js on the main page;
Basic writing method of modularization:
define(function(require,exports,module){
})require: Load a module, followed by a js file name
exports: output
module: module
Give an example:
The first js file, get.js:
define(function(require,exports,module){
//将封装的这个函数，作为要输出的一个方法：其封装函数是用来返该元素所对应的属性的值。
exports.getStyle = function (obj,name){
//if判断考虑的是兼容的问题
if(obj.currentStyle){
return obj.currentStyle[name];
}else{
return getComputedStyle(obj,false)[name];
}
}
})The second file: StarMove.js
define(function(require,exports,module){
//加载上一个模块
var get = require('get');
//在输出一个方法封装的运动框架
exports.move = function move(obj,json,complete){
//为了解决计时器多次调用出现的问题，在开始就清除它
clearInterval(obj.timer);
//判断有没有输入这个参数，如果没有进行默认
var complete = complete || {};
complete.dur = complete.dur || 1000;
complete.easing = complete.easing || 'ease-out';
var count = parseInt(complete.dur/30);//总次数
//起始位置
var start = {};//{width:300,height:300}
var dis = {};
//{width:300,height:300}
for(var name in json){
start[name] = parseFloat(get.getStyle(obj,name));
dis[name] = json[name] - start[name];
}
var n = 0;//当前步数
obj.timer = setInterval(function(){
n++;
for(var name in json){
var a = n/count;
switch(complete.easing){
case 'linear':
var cur = start[name] + a*dis[name];
break;
case 'ease-in':
var cur = start[name] + Math.pow(a,3)*dis[name];
break;
case 'ease-out':
var a = 1-n/count;
var cur = start[name] + (1-Math.pow(a,3))*dis[name];
break;
}
if(name == 'opacity'){
obj.style[name] = cur;
obj.style.filter = 'alpha('+cur*100+')';
}else{
obj.style[name] = cur +'px';
}
}
if(n == count){
clearInterval(obj.timer)
complete.fn && complete.fn();
}
},30)
}
})The third js file slide.js
define(function (require,exports,module){var move = require('StartMove');var aBtn = document.getElementById('banner').getElementsByTagName('span');var oUl = document.getElementById('banner').getElementsByTagName('ul')[0];var aLi = oUl.children; //三张图片所占的宽度，length返回的是字符串中的字符数oUl.style.width = aLi.length*aLi[0].offsetWidth+'px';
exports.slide = function(){for(var i=0;i<aBtn.length;i++){
aBtn[i].index = i;
aBtn[i].onclick = function(){for(var i = 0;i<aBtn.length;i++){
aBtn[i].className ='';
}
aBtn[this.index].className = 'on';
move.move(oUl,{left:-this.index*aLi[0].offsetWidth});
}
}
}
})The fourth js file init.js
require(['slider'],function(mod){
mod.slide()
})
Main page banner .html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{
margin: 0;
padding: 0;
list-style: none;
}
#banner{
width: 830px;
height: 440px;
border: solid 1px;
margin: 50px auto;
position: relative;
overflow: hidden;
}
#banner ul{
position: absolute;
left: 0;
top: 0;/*width: 2490px;
height: 440px;
overflow: hidden;*/}
#banner ul li{
width: 830px;
height: 440px;float: left;
}
#banner p{
position: absolute;
left: 50%;
bottom: 10px;
margin-left: -30px;
}
#banner p span{
display: block;float: left;
width: 15px;
height: 15px;
margin-right: 6px;
background: #ccc;
border-radius: 50%;
}
#banner p .on{
background: red;
}</style>
<script type="text/javascript" src="require.js"></script>
</head>
<body>
<div id="banner">
<ul>
<li><img src="images/1.jpg"/></li>
<li><img src="images/2.jpg"/></li>
<li><img src="images/3.jpg"/></li>
</ul>
<p>
<span class="on"></span>
<span></span>
<span></span>
</p>
</div>
</body>
</html>will complete a carousel image encapsulated in a modular manner:
Pay attention to how to use require
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