Javascript 设置一个 JS 变量并在 html 标签中使用它
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Setting a JS variable and using it in html tag
提问by treasureireland
I have set a variable, and I need to pull in this variable into a html element, but I cant get it to print out the value, this is the code:
我已经设置了一个变量，我需要将这个变量拉入一个 html 元素中，但我无法让它打印出值，这是代码：
<script>
var randomnumber=Math.floor(Math.random()*11)
</script>
<div id="<script type="text/javascript">document.write(randomnumber)</script>"></div>
Thanks.
谢谢。
Edit: I just used a div as an example, but i need to add a random number to an img tag, as it is for a tracking tag, and needs a unique identifier. Is there a better way to go about this?
编辑：我只是以 div 为例，但我需要向 img 标签添加一个随机数，因为它用于跟踪标签，并且需要一个唯一标识符。有没有更好的方法来解决这个问题？
回答by Juan Mendes
Use
用
<script>
document.write('<div id="'+randomnumber+'" ></div>');
</script>
You can't open a script tag inside an attribute
您无法在属性内打开脚本标记
回答by Viren Rajput
Or you can create it using JS:
或者您可以使用JS以下方法创建它：
var randomnumber=Math.floor(Math.random()*11);
a = document.createElement('div');
a.setAttribute('id',randomnumber);
document.body.appendChild(a);
// if you know the exact class or ID where it is to be appended you can use
document.getElementsByClassName("myclass")[0].insertBefore(a, document.getElementsByClassName("beforeClass").firstChild);
This will create a div, with the idas the randomnumberand append it to the body
这将创建一个div,id作为randomnumber并将其附加到body
