Symbol.iterator is not a function [duplicate]

问题:

This question already has answers here:

for of loop querySelectorAll (9 answers)

Closed 4 years ago.

<div id="par">
    <span id="a1"></span>
    <span id="a2"></span>    
<div id="par2">     
    <span id="a3"></span>
    <span id="a4"></span>
</div>    
</div>

<script>


var ele = document.querySelectorAll('#par span');    

for( var p of ele ){
    console.log(p);
}


</script>

When i run this code I see error

Uncaught TypeError: ele[Symbol.iterator] is not a function

How to fix this problem ?

回答1:

Convert NodeList to Array for make it in iterable form, use Array.from() to convert it.

<div id="par">
  <span id="a1"></span>
  <span id="a2"></span>
  <div id="par2">
    <span id="a3"></span>
    <span id="a4"></span>
  </div>
</div>


<script>
  var ele = document.querySelectorAll('#par span');

  for (var p of Array.from(ele)) {
    console.log(p);
  }
</script>

---

Refer the following question for more info : Are HTMLCollection and NodeList iterables?