Uncaught TypeError: Cannot set properties of null (setting 'onblur')

这个错误通常是由于在JavaScript代码中尝试访问一个空对象的属性而引起的。在这种情况下，代码尝试设置一个onblur属性，但是该属性所在的对象为空或null，因此无法设置该属性。要解决这个问题，您需要检查代码中的对象是否为空或null，并确保在尝试访问其属性之前对其进行检查。以下是一些可能有用的解决方法：

1.检查对象是否为空或null：

if (obj != null) {
    obj.onblur = function() { ... };
}

2.使用jQuery的选择器来检查对象是否存在：

if ($('#obj').length) {
    $('#obj').on('blur', function() { ... });
}

3.使用try-catch语句来捕获错误并处理它：

try {
    obj.onblur = function() { ... };
} catch (e) {
    console.log('Error: ' + e.message);
}

相关问题

onblur.html:20 Uncaught TypeError: Cannot set properties of null

This error message indicates that you are trying to set a property on a null object. In other words, you are trying to access an element in the document that does not exist.

The error is occurring on line 20 of the onblur.html file, which suggests that there is an issue with the code on that line. Without seeing the code, it is difficult to determine the exact cause of the error.

Here are a few common reasons why this error might occur:

- The element you are trying to access does not exist in the HTML document.
- The element is not yet loaded when the JavaScript code is executed.
- There is a typo in the element ID or class name, causing the code to search for a non-existent element.

To fix the error, you should check the code on line 20 and make sure you are accessing the correct element. You should also ensure that the element exists in the HTML document and is loaded before the JavaScript code is executed. Finally, double-check any IDs or class names to make sure they are spelled correctly.

Uncaught TypeError: Cannot set properties of null (setting

'innerHTML')

This error message indicates that you are trying to set the innerHTML property of a null value, which is not possible. This usually happens when you are trying to access an element in the DOM that does not exist, or has not been loaded yet.

To fix this error, you should first check that the element you are trying to access exists in the DOM. You can do this by using the document.getElementById() method to retrieve the element by its ID. If the element does not exist, you can create it dynamically using the document.createElement() method.

Additionally, you should make sure that your JavaScript code is executed after the HTML document has been fully loaded. You can do this by placing your script tags at the end of the HTML document, or by using the window.onload event to ensure that your code is executed only after the page has finished loading.