TypeError: undefined is not iterable 错误信息表明,你尝试对一个未定义(undefined)的值进行迭代操作,但 undefined 不是一个可迭代对象。在 JavaScript 中,可迭代对象通常包括数组、字符串、Map、Set 等。 2. 常见原因 变量未正确初始化:在尝试迭代之前,变量没有被赋予一个可迭代的值。 异步数据处理错误:在异步操...
vue报错信息 原因是因为通过...扩展运算符进行赋值操作,当数据为undefined时候就会报这个错误。
在渲染一个从后端获取的列表时出现错误:indicating it's undefined,我去查看了控制台日志,确认数组中有 5 个子项。 class PubSubTopics extends React.Component{ constructor(props){ super(props); this.state = { pubsubtopics: ['one', 'two', 'three'], } } componentDidMount() { this.callBackEndA...
TypeError: undefined is not iterable (cannot read property Symbol(Symbol.iterator)) at macosRelease (/usr/local/lib/node_modules/cordova/node_modules/macos-release/index.js:28:26) at osName (/usr/local/lib/node_modules/cordova/node_modules/os-name/index.js:21:18) at new Insight (/usr/lo...
(http://host:port/__cypress/tests?p=cypress/support/index.js:2975:10) From Node.js Internals: TypeError: undefined is not iterable (cannot read property Symbol(Symbol.iterator)) at /Users/jasonzhang/Documents/code/foobar/e2e/node_modules/cypress-terminal-report/src/installLogsPrinter.js:151:...
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// 解决 undefined is not iterable if(tags){ this.$nextTick(() => { for (const tag of tags) { if (tag.to.path === this.$route.path) { this.$refs.scrollPane.moveToTarget(tag) // when query is different then update if (tag.to.fullPath !== this.$route.fullPath) { ...
重启项目、重新编译也会有问题，在RC 1.03.2008201的版本我尝试过更改基础库、注释代码留下一个空的...
vue报错TypeError: undefined is not iterable (cannot read property Symbol(Symbol.iterator)),vue报错信息...
I have defined my watch function below: watch([a, b], ([currentA,currentB], [prevA, prevB]) => { ... } During the first iteration, prevA & prevB are undefined at the beginning, which causes TypeError: undefined is not iterable! It's not ...