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button button, combined with the onclick event, validates and submits the form

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Nov 30, 2016 pm 11:59 PM

<span style="color: #0000ff"><!</span><span style="color: #ff00ff">DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"</span><span style="color: #0000ff">></span>
<span style="color: #0000ff"><</span><span style="color: #800000">html </span><span style="color: #ff0000">xmlns</span><span style="color: #0000ff">="http://www.w3.org/1999/xhtml"</span><span style="color: #0000ff">></span>
 <span style="color: #0000ff"><</span><span style="color: #800000">head</span><span style="color: #0000ff">></span>
  <span style="color: #0000ff"><</span><span style="color: #800000">title</span><span style="color: #0000ff">></span> new document <span style="color: #0000ff"></</span><span style="color: #800000">title</span><span style="color: #0000ff">></span>
  <span style="color: #0000ff"><</span><span style="color: #800000">meta </span><span style="color: #ff0000">http-equiv</span><span style="color: #0000ff">="Content-Type"</span><span style="color: #ff0000"> content</span><span style="color: #0000ff">="text/html;charset=UTF-8"</span> <span style="color: #0000ff">/></span>
  <span style="color: #0000ff"><</span><span style="color: #800000">style </span><span style="color: #ff0000">type</span><span style="color: #0000ff">="text/css"</span><span style="color: #0000ff">></</span><span style="color: #800000">style</span><span style="color: #0000ff">></span>
  <span style="color: #0000ff"><</span><span style="color: #800000">script </span><span style="color: #ff0000">type</span><span style="color: #0000ff">="text/javascript"</span><span style="color: #0000ff">></span>
  <span style="background-color: #f5f5f5; color: #008000">//</span><span style="background-color: #f5f5f5; color: #008000">button 按钮，结合onclick事件，验证和提交表单</span>
  <span style="background-color: #f5f5f5; color: #0000ff">function</span><span style="background-color: #f5f5f5; color: #000000"> checkForm(){
        </span><span style="background-color: #f5f5f5; color: #008000">//</span><span style="background-color: #f5f5f5; color: #008000">判断用户名是否为空</span>
        <span style="background-color: #f5f5f5; color: #0000ff">if</span><span style="background-color: #f5f5f5; color: #000000">(document.form1.username.value</span><span style="background-color: #f5f5f5; color: #000000">==</span><span style="background-color: #f5f5f5; color: #000000">""</span><span style="background-color: #f5f5f5; color: #000000">){
                window.alert(</span><span style="background-color: #f5f5f5; color: #000000">"</span><span style="background-color: #f5f5f5; color: #000000">用户名不能为空</span><span style="background-color: #f5f5f5; color: #000000">"</span><span style="background-color: #f5f5f5; color: #000000">);
        }</span><span style="background-color: #f5f5f5; color: #0000ff">else</span> <span style="background-color: #f5f5f5; color: #0000ff">if</span><span style="background-color: #f5f5f5; color: #000000">(document.form1.username.value.length</span><span style="background-color: #f5f5f5; color: #000000"><</span><span style="background-color: #f5f5f5; color: #000000">5</span> <span style="background-color: #f5f5f5; color: #000000">||</span><span style="background-color: #f5f5f5; color: #000000"> document.form1.username.value.length</span><span style="background-color: #f5f5f5; color: #000000">></span><span style="background-color: #f5f5f5; color: #000000">20</span><span style="background-color: #f5f5f5; color: #000000">){
            window.alert(</span><span style="background-color: #f5f5f5; color: #000000">"</span><span style="background-color: #f5f5f5; color: #000000">用户名长度必须介于5-50个字符之间！</span><span style="background-color: #f5f5f5; color: #000000">"</span><span style="background-color: #f5f5f5; color: #000000">);
        }</span><span style="background-color: #f5f5f5; color: #0000ff">else</span><span style="background-color: #f5f5f5; color: #000000">{
            </span><span style="background-color: #f5f5f5; color: #008000">//</span><span style="background-color: #f5f5f5; color: #008000">使用form对象的submit()方法，实现提交。</span>
<span style="background-color: #f5f5f5; color: #000000">            document.form1.submit();        
        }
  }
 </span><span style="color: #0000ff"></</span><span style="color: #800000">script</span><span style="color: #0000ff">></span>
 <span style="color: #0000ff"></</span><span style="color: #800000">head</span><span style="color: #0000ff">></span>
 <span style="color: #0000ff"><</span><span style="color: #800000">body</span><span style="color: #0000ff">></span>
  <span style="color: #0000ff"><</span><span style="color: #800000">form </span><span style="color: #ff0000">name</span><span style="color: #0000ff">="form1"</span><span style="color: #ff0000"> method</span><span style="color: #0000ff">="get"</span><span style="color: #ff0000"> action</span><span style="color: #0000ff">="login.php"</span><span style="color: #0000ff">></span><span style="color: #000000">
  用户名：</span><span style="color: #0000ff"><</span><span style="color: #800000">input </span><span style="color: #ff0000">type</span><span style="color: #0000ff">="text"</span><span style="color: #ff0000"> name</span><span style="color: #0000ff">="username"</span> <span style="color: #0000ff">/></span><span style="color: #000000">
  密码：</span><span style="color: #0000ff"><</span><span style="color: #800000">input </span><span style="color: #ff0000">type</span><span style="color: #0000ff">="password"</span><span style="color: #ff0000"> name</span><span style="color: #0000ff">="userpwd"</span> <span style="color: #0000ff">/></span>
  <span style="color: #0000ff"><</span><span style="color: #800000">input </span><span style="color: #ff0000">type</span><span style="color: #0000ff">="button"</span><span style="color: #ff0000"> value</span><span style="color: #0000ff">="提交表单"</span><span style="color: #ff0000"> onclick</span><span style="color: #0000ff">="checkForm()"</span> <span style="color: #0000ff">/></span>
  <span style="color: #0000ff"></</span><span style="color: #800000">form</span><span style="color: #0000ff">></span>
 <span style="color: #0000ff"></</span><span style="color: #800000">body</span><span style="color: #0000ff">></span>
<span style="color: #0000ff"></</span><span style="color: #800000">html</span><span style="color: #0000ff">></span>

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