学习JS遇到的问题_html/css_WEB-ITnose

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Release: 2016-06-21 08:46:36
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  • 关于document.body.innerHTML

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>tit</title>    <style type="text/css">        div{width: 30px;height: 30px;font-size: 12px;color: #fff;background: red;line-height: 30px;text-align: center;position: absolute;}    </style>    <script type="text/javascript">        window.onload=function(){            var oDiv=document.getElementsByTagName('div');            var oBtn=document.getElementsByTagName('input');            var m=0;            oBtn[0].onclick=function(){                    for(i=0;i<9;i++){                        document.body.innerHTML+='<div>'+i+'</div>';                    }            }        }    </script></head><body>    <input type="submit"value='按钮' name=""></body></html>
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再次点击按钮,按钮无效的原因:

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