JS 按钮下一步（onclick点击事件）

 1 <html>
 2     <head>
 3         <meta charset="UTF-8">
 4         <title></title>
 5     </head>
 6     <body>
 7         <input id="aaa" type="checkbox" onclick="check()" />
 8         <input type="button" value="下一步" id="btn" disabled="disabled"/>
 9     </body>
10 </html>
11 <script>    
12     function check(){
13         var aaa = document.getElementById(\'aaa\');
14         if(aaa.checked){
15         document.getElementById(\'btn\').removeAttribute(\'disabled\');
16     }else{
17         document.getElementById(\'btn\').setAttribute(\'disabled\',\'disabled\');
18     }
19 }
20 </script>

removeAttribute（\'要删除的属性\'）删除属性

setAttribute（\'属性\',\'属性值\'）添加属性

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