邮箱正则表达式的js验证方法

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<script type="text/javascript"> 
function isEmail(str){ 
var reg = /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+/; 
return reg.test(str); 
} 
var str = 'test@hotmail.com'; 
document.write(isEmail(str)+'<br />'); 
var str2 = 'test@sima.vip.com'; 
document.write(isEmail(str2)+'<br />'); 
var str3 = 'te-st@qq.com.cn'; 
document.write(isEmail(str3)+'<br />'); 
var str4 = 'te_st@sima.vip.com'; 
document.write(isEmail(str4)+'<br />'); 
var str5 = 'te.._st@sima.vip.com'; 
document.write(isEmail(str5)+'<br />'); 
</script>

<script type="text/javascript"> function isEmail(str){ var reg = /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+/; return reg.test(str); } var str = 'test@hotmail.com'; document.write(isEmail(str)+'<br />'); var str2 = 'test@sima.vip.com'; document.write(isEmail(str2)+'<br />'); var str3 = 'te-st@qq.com.cn'; document.write(isEmail(str3)+'<br />'); var str4 = 'te_st@sima.vip.com'; document.write(isEmail(str4)+'<br />'); var str5 = 'te.._st@sima.vip.com'; document.write(isEmail(str5)+'<br />'); </script>