常用js表单验证

1.
if($("#email").val()!=''){
   var chemEmail1=/\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/;
if(!chemEmail1.test(document.getElementById("email").value)){
alert("Email的格式不正确!");
document.getElementById("email").focus();
return false;
        }                                                
    }
2.
if($("#out_link").val()!=''){
   var strRegex = "^((https|http|ftp|rtsp|mms)?://)"
+ "?(([0-9a-z_!~*'().&=+$%-]+: )?[0-9a-z_!~*'().&=+$%-]+@)?" // ftp的user@
+ "(([0-9]{1,3}\.){3}[0-9]{1,3}" // IP形式的URL- 199.194.52.184
+ "|" // 允许IP和DOMAIN（域名）
+ "([0-9a-z_!~*'()-]+\.)*" // 域名- www.
+ "([0-9a-z][0-9a-z-]{0,61})?[0-9a-z]\." // 二级域名
+ "[a-z]{2,6})" // first level domain- .com or .museum
+ "(:[0-9]{1,4})?" // 端口- :80
+ "((/?)|" // a slash isn't required if there is no file name
+ "(/[0-9a-z_!~*'().;?:@&=+$,%#-]+)+/?)$";
var re = new RegExp(strRegex);
if (!re.test(document.getElementById("out_link").value)){
alert("外部链接的格式不正确!");
document.getElementById("out_link").focus();
return false;
        }                                                
    }
   
3.
if(document.getElementById('enternum').value!=''){
var enternum=document.getElementById('enternum').value;
if(!(/^[1-9]d*|0$/.test(enternum))){
alert("请输入正整数！");
document.getElementById('enternum').focus();
return;
}
  }
4.
if(document.getElementById('minutes').value!=''){
var minutes=parseInt(document.getElementById('minutes').value);
if(minutes<0||minutes>59){
alert("请输入0-59之间的整数！");
document.getElementById('minutes').focus();
return;
}
}
5.
var passW=document.getElementById('password').value;
      if(/^\s+\w*$/.test(passW)){
      alert("不允许有开头为空格的密码");
      document.getElementById('password').value='';