Javascript TypeError：表达式的结果不是对象
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Javascript TypeError: result of expression is not an object
提问by Abhishek
This should be real simple... But it ain't... >.<
这应该很简单...但它不是...>.<
var x = document.getElementById('x');
function snooze()
{
x.style.height = '10px';
}
Upon execution, the error I get is:
执行后，我得到的错误是：
TypeError: Result of expression 'x' [null] is not an object.
TypeError: Result of expression 'x' [null] is not an object.
Edit: Heads up, it works when I put the var declaration inside the function. I don't understand... :-(
编辑：注意，当我将 var 声明放在函数中时它会起作用。我不明白... :-(
function snooze()
{
var x = document.getElementById('x');
x.style.height = '10px';
}
回答by David Tang
Either:
任何一个：
- There is no element on the page with
id="x". - The code is running before the document is loaded.
- 页面上没有带有 的元素
id="x"。 - 代码在加载文档之前运行。
If an element with id="x"exists, try:
如果id="x"存在的元素，请尝试：
window.onload = function () {
// your code in here
};
