Question

有人知道这是怎么回事吗？我不明白为什么getElementByTagName首先应该是一个函数，它已经在函数内部，并且由提交按钮调用。

    <body>        
    <form novalidate>
      First Name:<input id="fname" pattern="[a-zA-Z\W]" type="text" name="First Name">
      Last Name:<input id="lname" pattern="[a-zA-Z\W]" type="text" name="Last Name">
      Number:<input id="num" pattern="[0-9\D]"  type="text" name="Number">
      Email:<input id="email" pattern="/^[a-zA-Z0-9\D\W._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/" type="text" name="Email">
      <button type="button" id="submit">Send</button>
    </form>
</body>


<script>
document.getElementById('submit').addEventListener("click", function() {
var inputFields = document.getElementByTagName("input");

for (var i = 0; i < inputFields.length; i++) {
  var theInput = inputFields[i].value;
  var thePattern = new RegExp(inputFields[i].pattern);
  var theTest = thePattern.test(theInput);
  console.log(theTest);

  if (theTest === false) {
    console.log(inputFields[i].name + " is incorrect");
  }

}
} )

 </script>

未捕获的TypeError：document.getElementByTagName不是函数

0 个答案: