Understanding JavaScript library (1) - first experience encapsulation to get node method
1. Understanding JavaScript Libraries
A JavaScript library is to organize various commonly used code fragments into a js file to form a package, and this package is a JavaScript library.
There are too many excellent open source JavaScript libraries today, such as: jQuery, Prototype, Dojo, Extjs, etc. These JavaScript libraries have effectively encapsulated the most commonly used codes to facilitate development and improve efficiency.
2. First experience - encapsulating the method of obtaining nodes
HTML file
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>获取节点方法</title>
<!--引入文件-->
<script src="js/base.js"></script>
<script src="js/index.js"></script>
</head>
<body>
<div id="a">a</div>
<input type="text" name="b" value="b" />
<p>hellow</p>
</body>
</html>base.js file
/**
* Author pangtong
*/
/**
* 获取节点方法
*/
//函数式
function getId(id){
return document.getElementById(id);
}
function getName(name){
return document.getElementsByName(name);
}
function getTag(tag){
return document.getElementsByTagName(tag);
}
//对象式
var El = {
getId:function (id){
return document.getElementById(id);
},
getName:function (name){
return document.getElementsByName(name);
},
getTag:function (tag){
return document.getElementsByTagName(tag);
}
};index.js file
/**
* Author pangtong
*/
window.onload = function(){
console.log(getId('a'));
console.log(getName('b')[0]);
console.log(getTag('p')[0]);
console.log(El.getId('a'));
console.log(El.getName('b')[0]);
console.log(El.getTag('p')[0]);
}