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Simple implementation of JS encapsulation of dom operations_javascript skills

WBOY
WBOYOriginal
2016-05-16 15:28:041654browse

This article mainly introduces the simple implementation of JS to encapsulate DOM operations. Let’s go directly to the code: 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>js</title>
</head>
<body>
  <div id="aa">测试</div>
</body>
<script type="text/javascript">
//duquery
(function(w){//定义立即执行函数，传入全局对象window  
  function duquery(id){//定义函数，实现去new的操作，  
    function Duquery(id){//定义类
      this.ele=document.getElementById(id);//id查找    
      return this;//返回对象
    };
    Duquery.prototype.html=function(val){//利用原型添加设置html的方法
      this.ele.innerHTML=val;
      return this;//返回对象，执行后可链式操作
    };
    Duquery.prototype.attr=function(key,val){//添加设置属性的方法
      this.ele.setAttribute(key,val);
      return this;
    };
    Duquery.prototype.css=function(key,val){//添加设置样式的方法
      this.ele.style[key]=val;
      return this;
    };
    Duquery.prototype.on=function(event,fun){
      this.ele.addEventListener(event,fun,false);
      return this;
    };  
    return new Duquery(id);//去new处理，返回实例对象
  };
  
  duquery.wait=function(time,fun){//添加延时静态方法，可通过函数名直接使用
    setTimeout(fun,time);
  };  
  duquery.each=function(arr,callback){//添加遍历迭代静态方法
    for(var key in arr){
      callback(key,arr[key]);
    };
  };  
  w.$$=w.duquery=duquery;//类追加到全局对象自定义属性上，可直接调用
  
})(window);
//code
window.onload=function(){
  //类的使用和操作
  $$("aa").attr("bb","456").css("height","200px");
  $$.wait(5000,function(){$$("aa").html("好的")});
  $$("aa").on("click",function(){
    $$("aa").html("事件").css("color","#ffa");
  });
  $$.each([1,2,3,4,5,6],function(index,val){
    if(val==3){
      alert(val);
    }else{
    };
  });
};
</script>
</html>

I will share with you a common DOM operation in js. The code is as follows

<html>
 
<head></head>
<body>
 
<form id="myform">
<input type="text" value="获取id" id="getId" >
 
<input type="button" value="huhu" id="getId1" >
<span>努力学习</span>
 
</form>
 
<script>
//DOM 对象方法
 
//getElementById返回带有指定 ID 的元素
 
/*var byid = document.getElementById("getId");
alert(byid.value);      //获取id
 
//getElementsByTagName返回包含带有指定标签名称的所有元素的节点列表(集合/节点数组)
 
var tagname = document.getElementsByTagName("input");
alert(tagname[0].value);    //获取id
 
//createElement创建元素节点
 
var myform = document.getElementById("myform");
var e = document.createElement("input");    //创建input元素
 
e.type="button";                //给input的type定义值
e.value="嘻嘻哈哈";                //给input的value定义值
 
//appendChild() 把新的子节点添加到指定节点
 
myform.appendChild(e);              //往form里添加创建好的input表单
 
//insertBefore() 在指定的子节点前面插入新的子节点
 
document.body.insertBefore(e,myform);      //把input添加到form前面            
 
//createAttribute()创建属性节点
 
var att=document.createAttribute("class");
att.value="democlass";
 
//setAttributeNode()方法添加新的属性节点
 
document.getElementsByTagName("input")[0].setAttributeNode(att);
 
//createElement创建元素节点
 
var newel = document.createElement("p");
 
//createTextNode() 方法创建新的文本节点
 
newtext=document.createTextNode('xixihaha');
 
//appendChild() 把新的子节点添加到指定节点
 
newel.appendChild(newtext);
 
//appendChild() 把新的子节点添加到指定节点
 
myform.appendChild(newel);
 
// setAttribute() 可以在属性不存在的情况下创建新的属性，我们可以使用这个方法来创建新属性
 
x=document.getElementsByTagName("input");
x[0].setAttribute("asdasd","first");
 
//replaceChild() 方法用于替换节点
 
//第一个参数是新的节点
//第二个参数是旧的节点(要被替换掉的节点)
 
var y1=document.getElementsByTagName("input")[1];
var y2=document.getElementsByTagName("input")[2];
 
myform.replaceChild(y2,y1);
 
//removeChild() 方法删除指定的节点
 
//当已定位需要删除的节点时，就可以通过使用 parentNode 属性和 removeChild() 方法来删除此节点
var span1=document.getElementsByTagName("span")[0];
 
span1.parentNode.removeChild(span1);
*/
 
</script>
 
</body>
</html>

The above are the common operations related to DOM in js. I hope it will be helpful to everyone's learning.

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