"default" is not defined
时间: 2023-11-16 21:05:15 浏览: 14
This error message usually occurs when you try to use a variable or function that has not been defined yet.
In JavaScript, the "default" keyword is used in switch statements to specify the code to be executed if no matching case statement is found. However, it cannot be used as a variable or function name.
To resolve this error, make sure all your variables and functions are properly defined before using them in your code. Check for any typos or syntax errors that may be causing the problem.
相关问题
is not defined
"is not defined"是一种错误类型,通常与引用未定义的变量有关。当你尝试引用一个未被定义的变量时,会抛出一个ReferenceError错误。例如,如果你在全局作用域内引用一个没有声明的变量b,就会出现"Uncaught ReferenceError: b is not defined"的错误信息。在大括号{}内部声明的变量在其作用域内是可以访问的,所以如果在大括号内部使用console.log(b),b的值会被正常输出,而不会出现"is not defined"的错误提示。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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plus is not defined
当在浏览器中调试时出现"plus is not defined"的错误提示,这是因为plus是5+Runtime的内部对象,普通浏览器中没有plus环境,只有在HBuilder真机运行、打包后或流应用环境下才能运行plus api。所以在普通浏览器中调用plus api时,控制台会输出"plus is not defined"的错误提示。为了解决这个问题,可以在需要调用plus的地方加上条件编译,使用#ifdef APP-PLUS来限制只在App平台下的代码中调用plus api。另外,还需要确保当前页面引入了mui.js,否则也会出现"mui is not defined"的错误提示。此外,还需要注意在plus和mui完成初始化之前不要调用相关API,可以在plusready的回调事件中调用plus api,确保在初始化完成后再调用。例如:
```
document.addEventListener('plusready', function() {
// 在这里调用plus api
}, false);
```
这样可以避免"plus is not defined"的错误提示。\[1\]\[2\]\[3\]
#### 引用[.reference_title]
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- *3* [MUI -- plus初始化原理及plus is not defined,mui is not defined 错误汇总](https://blog.csdn.net/longduyuan/article/details/84805880)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^control_2,239^v3^insert_chatgpt"}} ] [.reference_item]
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