我想通過類名獲取內容,但是當我運行腳本時,我得到了未定義的內容......我在做什麼錯了?按類名獲取內容javascript
<!DOCTYPE html>
<html>
<body>
<td class="a-size-base">B000FNFSPY</td>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
var x = document.getElementsByClassName("a-size-base").innerText;
document.write(x)
}
</script>
</body>
</html>