如何通过JavaScript更改FontSize？

Question

此代码无效

var span = document.getElementById("span");
span.style.fontsize = "25px";
span.innerHTML = "String";

Answer 1

JavaScript区分大小写.

所以,如果你想改变字体大小,你必须去:

span.style.fontSize = "25px";

Answer 2

<span id="span">HOI</span>
<script>
   var span = document.getElementById("span");
   console.log(span);

   span.style.fontSize = "25px";
   span.innerHTML = "String";
</script>

您的代码中有两个错误:

1. document.getElementById - 这将检索ID为"span"的元素,但未在span-element上指定id.

2. Javascript中的首都 - 你也忘记了大小的资本.