JavasScript判断输入框不为空

<form name="form1" method="POST" action="add.php"> <table width="213" border="0" cellpadding="0" cellspacing="0" background="../images/zz13.gif"> <tr> <td width="40" height="20" align="left" valign="top">姓名:</td> <td width="173" align="left" valign="top"><input type="text" name="si_name" /></td> </tr> <tr> <td height="20" align="left" valign="top">手机:</td> <td align="left" valign="top"><input type="text" name="si_tel" /></td> </tr> <tr> <td height="20" align="left" valign="top">楼盘:</td> <td align="left" valign="top"><input type="text" name="si_bname" /></td> </tr> <tr> <td height="20" align="left" valign="top">邮箱:</td> <td align="left" valign="top"><input type="text" name="email" /></td> </tr> <tr> <td height="20" align="left" valign="top">城市:</td> <td align="left" valign="top"><select name="si_region"> <option value="上海" selected="selected">上海</option> <option value="南京">南京</option> <option value="广州">广州</option> <option value="深圳">深圳</option> <option value="杭州">杭州</option> <option value="苏州">苏州</option> <option value="珠海">珠海</option> <option value="其他">其他</option> </select> </td> </tr> <tr> <td height="22" align="left" valign="top">性别:</td> <td align="left" valign="top"><input type="radio" name="si_sex" value="先生" />先生 <input type="radio" name="si_sex" value="女士" />女士</td> </tr> <tr> <input type="hidden" name="ok" value="ok" /> <td height="60" colspan="2" align="center" valign="top"><input name="image" type="image" onclick="return check()" src="../images/zz9.gif" mce_src="data:images/zz9.gif" width="144" height="30" img="img"/></td> </tr> </table> </form>

<!--=========================Google==========================================--> <mce:script type="text/javascript"><!-- var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); // --></mce:script> <mce:script type="text/javascript"><!-- try { var pageTracker = _gat._getTracker("UA-3919763-4"); pageTracker._trackPageview(); } catch(err) {} // --></mce:script> <!--===================================================================--> <!--===============GS==========start================--> <mce:script src="//www.webdissector.com/js/gs.js" mce_src="http://www.webdissector.com/js/gs.js" type='text/javascript'></mce:script> <mce:script type='text/javascript'><!-- if(window.GridsumWebDissector){ var _gsTracker =GridsumWebDissector.getTracker('GWD-000126'); //每次我给你的ID号。 _gsTracker.setOriginalUrl("http://www.boloni.cn/boloni/zt/100523/rui/bm.htm"); //那个页面的不分渠道的URL _gsTracker.enableHeatmap(); _gsTracker.setDocWidth(980); _gsTracker.setPageVersion("ver20100510"); //填入当前日期 _gsTracker.track(); } // --></mce:script> <!--===============GS==========end================--> <SCRIPT LANGUAGE="JavaScript"> <!-- function check() { var Obj = document.getElementsByName("si_sex"); for(i=0;i<Obj.length;i++){if(Obj[i].checked){break}}; if(i==Obj.length){alert("请选择性别！");return false}else{} if (document.form1.si_name.value==""){ alert("请填写真实姓名"); return false; } if (document.form1.si_tel.value==""){ alert("请填写手机号码"); return false; } var myreg = /^(((13[0-9]{1})|159|(15[0-9]{1}))+/d{8})$/; if(!myreg.test(document.form1.si_tel.value)){ alert('请输入有效的手机号码！'); document.form1.si_tel.focus(); return false; } if (document.form1.si_bname.value==""){ alert("请填写楼盘名称"); return false; } if (document.form1.email.value==""){ alert("请填写EMAIL"); return false; } if (!document.form1.email.value.match(/^[/w]{1}[/w/./-_]*@[/w]{1}[/w/-_/.]*/.[/w]{2,4}$/i) ) { alert ("请输入有效合法的E-mail地址 ！"); return false; } } //--> </SCRIPT>