javascript: validate email address

validate_email_addr.js

function isEmailAddr(object) {
  var s = document.getElementById(object.id).value;
  var pattern = /^[a-zA-Z0-9_\-]{1,}@[a-zA-Z0-9_\-]{1,}\.[a-zA-Z0-9_\-.]{1,}$/;
  if (s !== "") {
    if (!pattern.exec(s)) {
      alert('请输入正确的邮箱地址');
      object.value = "";
      object.focus();
    }
  }

}