js how to write plug-in tutorial sharing
This article mainly shares with you tutorials on how to write plug-ins in js. I hope it can help you.
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Document</title>
<style type="text/css">
#demo-1, #demo-2 {
width: 200px;
height: 200px;
border: 1px solid #ddd;
}
</style>
</head>
<body>
<h3>点击add可以添加个自input的内容到p里并实现变颜色</h3>
<!--组件实例1-->
<p id="demo-1">
<input type="" name="" id="" value="好的" />
<button id="add-1">add</button>
</p>
<br /> <br />
<!--组件实例2-->
<p id="demo-2">
<input type="" name="" id="" value="11" />
<button id="add-2">add</button>
</p>
<script type="text/javascript">
//这里是插件的代码；我为了方便都写到一个html中了；请把这个script标签中的内容单独写在一个js文件里
//整个插件写在一个立即执行函数里；就是function(){}();函数自执行；保证里面的变量不会与外界互相影响
//头部的win啊,doc啊 $ 啊都是底部的window,document,jQuery的映射；方便内部直接调用；
//当然你不引用jq的话头部的$和底部的jQuery干掉；你若引用了更过的依赖可以依次添加；
//最后面的undefined可不写；最好写了；保证里面再出现的undefined是未定义的意思；不被其他东西赋值；
//好了下面是时候展现真正的技术了
//function前的!号(叹号)或者;(分号)这不是写错了,为了防止那个二货写的js结束没有分号；而可能发生报错
/*
;function(win,doc,$,undefined){
}(window,document,jQuery)或者写在一个闭包里(function(){ }())
*/
(function (win, doc, undefined) {
//我们随便写一个插件吧 比如你要点击按钮 添加input的值到 p里
var addHtml = function (demo, btn) {//插件名，调用的时候直接new一下插件名就行了并传参数或者传对象(一般这个函数名手写字母大写比较好，构造函数嘛，其实也是函数)
//很明显我要传id名；这里传什么都可以的其实；
this.p = doc.getElementById(demo);//为什么把获取的id传给this.p呢？this的指向为调用的实例；我们此时姑且认为this就指向这个函数；因为这样我们之后再想获取这个p就可以直接用this.p了好吗；而不是在document.getElementById（。。。。）
this.btn = doc.getElementById(btn);
this.Input = this.p.getElementsByTagName("input")[0];//既然找到了p我们在找下p下面的input；当然你要不input用获取id的形式传参数我没有意见
this.num = 0;//你也可以写一些其他的默认的东西；比如默认的变量啦；方便下面调用；这里写了什么都不会报错；只是有用没用的问题这行可以忽略
this.author = "lianxiaozhuang";
this.init();//执行下你下面写的函数吧；你想想；如果整个插件没有执行函数；多不好；一堆方法function就不调用；对；这里是调用的时候最开始执行的函数
}
//；给构造函数addHtml对象原型里添加属性（方法）
addHtml.prototype = {//给函数写方法；这里可能不止一个函数；你还记得你在全局里写一个个的function吗；贼乱；
//找也不好找；把一个个函数都写到对象的属性里；调用函数就直接调用对象的属性；
constructor: addHtml,//构造器指向构造函数；这行其实不写没啥毛病；不过有时候防止构造器指向Object的情况；你还是装逼写上吧；
init: function () {//这里的init；你也可以写成 nimade:function(){ }都没有问题；就是在addHtml函数里this.init();执行下；你明白了这里的this了吧；整个插件里this都是只得这个函数（实例）；除非你又引入了其他的函数里的（其他函数里的可能指向就是window了）
var _self = this;////把this保存下来防止在局部函数内部取不到（局部函数内部取得this可能是别的）
this.btn.onclick = function () {
var _val = _self.Input.value;
var tempp = doc.createElement("p");//创建临时p存放获取input的值
tempp.innerHTML = _val;
//console.log(tempp);
_self.p.appendChild(tempp);
_self.setColor();//你把所有方法都写在init里绝对没问题；还是那句话；说好的松耦合呢；说好的不写一堆堆的function一层层乱套呢
};
},
setColor: function () {
//console.log(this.p)
this.p.style.color = "red"
}/*,
otherFun(){
//当然你还可以扩展其他方法；这些方法之间都可以互相调用；
只要用this.方法名 就行了；如果在取不到this比如上面的click函数中的this指向点击的button；只要在写var _self = this;就可以用_self 代替this（函数实例）了；当然_self 也可以写成别的 比如$this等自定义的
}*/
}
win.addHtml = addHtml;//把这个对象附给window底下的 名字叫addHtml的对象；要不你调用的时候 new addHtml() 怕在window的环境下找不到；
}(window, document))
</script>
<script type="text/javascript">
new addHtml("demo-1", "add-1");//这里是实例1调用插件的代码
new addHtml("demo-2", "add-2"); //这里是实例2调用插件的代码
//是不是明白为什么要写插件了；要封装；两个相同组件即使有相同的class名在dom操作的时候也不会相互冲突；因为他们都new出来了个自的实例；有自己的this；有自己的一套方法了（其实方法都在原型里是公用的；操作各自的dom）
</script>
<!--这里是最简单的插件写法；当然还有传对象参数的插件等等。。。。-->
</body>
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