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今天打得代码

<!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" xml:lang="zh-cn">
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
    <title>网页标题</title>
    <meta name="keywords" content="关键字列表" />
    <meta name="description" content="网页描述" />
    <link rel="stylesheet" type="text/css" href="" />
    <style type="text/css"></style>
    <script type="text/javascript">
    function setAtt(){
        var imgObj=document.getElementById("getImg");
        imgObj.setAttribute("width",200);
        imgObj.setAttribute("src","images/2.jpg");
    
    }
    function getAtt(){
        var imgObj=document.getElementById("getImg");
        alert(imgObj.getAttribute("src"));
    
    }
      function removeAtt(){
      
        var imgObj=document.getElementById("getImg");
        imgObj.removeAttribute("width");
      }
    
    </script>
</head>
<body>
<img src="http://www.mamicode.com/images/1.jpg"  id="getImg">
<input type="button" value="http://www.mamicode.com/修改" onclick="setAtt()"/>
<input type="button" value="http://www.mamicode.com/获取" onclick="getAtt()"/>
<input type="button" value="http://www.mamicode.com/删除" onclick="removeAtt()"/>

</body>
</html>

技术分享

<!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" xml:lang="zh-cn">
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
    <title>网页标题</title>
    <meta name="keywords" content="关键字列表" />
    <meta name="description" content="网页描述" />
    <link rel="stylesheet" type="text/css" href="" />
    <style type="text/css"></style>
    <script type="text/javascript">
    window.onload=function(){
        var qx_obj=document.getElementById("qxobj");
        var quxiao_obj=document.getElementById("quxiaoobj");
        var fx_obj=document.getElementById("fxobj");
        var ah_obj=document.getElementsByName("suju");
        //全选按钮
        qx_obj.onclick=function(){
            
            for(var i=0;i<ah_obj.length;i++){
                ah_obj[i].checked=true;
            }
        
        
        }
        
        // 取消按钮
        quxiao_obj.onclick=function(){
            
            for(var i=0;i<ah_obj.length;i++){
                ah_obj[i].checked=false;
            }
        
        }
        //反选选代码
          fx_obj.onclick=function(){
            
            for(var i=0;i<ah_obj.length;i++){
                if(ah_obj[i].checked==true)
                {
                    ah_obj[i].checked=false;
                }else{
                    ah_obj[i].checked=true;
                }
            }
        
        
        }
    
    }

    </script>
</head>
<body>
爱好1:<input type="checkbox" name="suju"/></br>
爱好2:<input type="checkbox" name="suju"/></br>
爱好3:<input type="checkbox" name="suju"/></br>
爱好4:<input type="checkbox" name="suju"/></br>
爱好5:<input type="checkbox" name="suju"/></br>
爱好6:<input type="checkbox" name="suju"/></br>
爱好7:<input type="checkbox" name="suju"/></br>
爱好8:<input type="checkbox" name="suju"/></br>
<input type="button" value="http://www.mamicode.com/全选" id="qxobj"/>
<input type="button" value="http://www.mamicode.com/取消" id="quxiaoobj"/>
<input type="button" value="http://www.mamicode.com/反选" id="fxobj"/>

</body>
</html>

技术分享

今天打得代码