无法在JS中将属性'innerHTML'设置为null
[英]Cannot set property 'innerHTML' of null in JS
问题描述
Code didn't work and still return 'f' world after function call, what's wrong with my code? 
代码不起作用，并且在函数调用后仍然返回“ f”世界，我的代码怎么了？ thanks for help 感谢帮助
HTML: HTML：
<html>
<head>
<script type="text/javascript" src="functions.js"></script>
</head>
<body onload="changeText()">
<p id="P1">
fu
</p>
</body>
</html>
JS: JS：
function changeText(){
document.getElementById("p1").innerHTML = "slm"
}
4 个解决方案
解决方案1
3 2019-01-08 13:55:34
Because the selector is case sensitive. 因为选择器区分大小写。 Try to use P1 instead of p1: document.getElementById("P1").innerHTML = "slm" 尝试使用P1代替p1： document.getElementById("P1").innerHTML = "slm"
解决方案2
2 2019-01-08 13:58:07
ID's in Javascript are case sensitive (all attributes are). Javascript中的ID区分大小写（所有属性都是）。 The ID in the HTML is P1 but you're looking for p1 so it's not finding it. HTML中的ID是P1但您正在查找p1因此找不到它。
解决方案3
0 2019-01-08 13:53:42
您输入的ID错误。注意P是大写字母，请尝试：
document.getElementById("P1").innerHTML = "slm"
解决方案4
0 已采纳 2019-01-08 15:45:07
please try this one, problem was that you can't call function changeText() : 请尝试这个，问题是您不能调用function changeText() ：
<html>
<head>
<script type="text/javascript">
function changeText(){
document.getElementById("P1").innerHTML = "slm"
}
</script>
</head>
<body onload="changeText()">
<p id="P1">fu</p>
</body>
</html>
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