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TypeError: Router.use() requires a middleware function but got a Object

1、错误描述C:\Users\Administrator.USER-0GUONPPBHK>cdG:\HBuilderXWork\Vue\serverC:\Users\Administrator.USER-0GUONPPBHK>g:G:\HBuilderXWork\Vue\server>nodeindexG:\HBuilderXWork\Vue\node_mod...

2019-07-04 16:30:09

如何使用vue.js组件模拟v-model指令?

1、问题描述在使用v-model指令实现输入框数据双向绑定,输入值时对应的这个变量的值也随着变化;但是这里不允许使用v-model,需要写一个组件实现v-model指令效果<divid="user"><inputtype="text"v-model="username"><label>{{username}}</...

2019-07-03 16:17:13

TypeError: Cannot read property 'apply' of undefined

1、错误描述Administrator@USER-0GUONPPBHKMINGW64/g/HBuilderXWork/Vue$npminstall--save-devgulpnpmWARNrollbackRollingbackreadable-stream@2.3.6failed(thisisprobablyha...

2019-07-01 11:26:29

1452-Cannot add or update a child row: a foreign key constraint fails

1、错误描述MySQL2、错误原因t_nums表中的name不属于t_stu表中的name,t_stu表中的name是字母和数字构成的,而t_nums表中name是数字构成的,两者没有重合的部分,所以会出现报错。3、解决办法(1)修改t_stu表中的name对应的值,使它属于t_nums表中的name值范围;(2)修改t_nums表中的name对应的值,...

2019-06-13 11:53:08

Uncaught DOMException: Failed to execute 'setAttribute' on 'Element': '#' is not a valid attribute

1、错误描述2、错误原因<current-user> <slotv-bind:user="user"> {{user.username}} </slot> <templatev-slot:default="slotProps"> {{slotProps.user.firstname}} </template&g...

2019-05-29 10:02:41

Uncaught TypeError: Cannot set property 'render' of undefined

1、错误描述2、错误原因<template> <arm-infoarm-title="hands"></arm-info></template><script> importVuefrom'vue' Vue.component('arm-info',{ props:['armTitle'], ...

2019-05-27 10:45:14

Cannot use v-for on stateful component root element because it renders multiple elements

1、错误描述2、错误原因<template> <blog-infov-for="infoininfos" v-bind:key="info.id" v:bind:title="info.title"></blog-info></template><script> expor...

2019-05-24 16:35:43

TypeError: react__WEBPACK_IMPORTED_MODULE_0___default.a.createClass is not a function

1、错误描述2、错误原因importReact,{Component}from'react';import{render}from'react-dom';importButtonfrom'react-bootstrap/Button';varTickTock=React.createClass({mixins:[SetIntervalMi...

2019-05-24 14:33:10

Target container is not a DOM element

1、错误描述2、错误原因importReact,{Component}from'react';import{render}from'react-dom';importButtonfrom'react-bootstrap/Button'constProPic=(props)=>{ return( <imgsrc={'http:...

2019-05-24 11:32:37

TypeError: instance.render is not a function

1、错误描述2、错误原因importReact,{Component}from'react';import{render}from'react-dom';importButtonfrom'react-bootstrap/Button'classInputReadextendsComponent{ constructor(){ return...

2019-05-24 10:38:18

Component(...): Nothing was returned from render

1、错误描述2、错误原因classColumn2DChartextendsReact.Component{render(){return(<ReactFusionchartstype="column2d"width="1200"height="600"dataFor...

2019-05-23 15:08:08

bash: create-react-app: command not found

1、错误描述Administrator@SKY-20160824VTFMINGW64/d/HBuilderProjects/cmn$npminstallcreate-react-appnpmWARNsaveErrorENOENT:nosuchfileordirectory,open'D:\HBuilderProjects\...

2019-05-23 00:10:38

Objects are not valid as a React child (found: [object HTMLDivElement])

1、错误描述2、错误原因importReactfrom'react';importReactDOMfrom'react-dom';import'./index.css';importAppfrom'./App';import*asserviceWorkerfrom'./serviceWorker';ReactDOM.render(<Ap...

2019-05-21 16:02:27

Element type is invalid: expected a string (for built-in components) or a class/function (for compos

1、错误描述2、错误原因importReactfrom'react';importReactDOMfrom'react-dom';importColumn2Dfrom'./components/Column2D.js'importlogofrom'./logo.svg';import'./App.css';functionApp(){...

2019-05-21 15:56:19

DOMException: Failed to execute 'setAttribute' on 'Element': ',' is not a valid attribute name

1、错误描述2、错误原因<template> <divid="column3dChart"> <fusioncharts:type="type" :width="width", :height="height" :dataFormat="dataFormat" :data...

2019-05-17 11:15:29

Uncaught SyntaxError: Inline Babel script: Unexpected token

1、错误描述2、错误原因<!DOCTYPEhtml><html> <head> <metacharset="UTF-8"> <title></title> <scripttype="text/javascript"src="../js/react.development.js"&g...

2019-05-10 14:30:09

Uncaught Error: The `style` prop expects a mapping from style properties to values, not a string

1、错误描述2、错误原因<!DOCTYPEhtml><html> <head> <metacharset="UTF-8"> <title></title> <scriptsrc="../js/react.development.js"></script> <...

2019-05-10 11:50:25

Uncaught SyntaxError: Inline Babel script: Adjacent JSX elements must be wrapped in an enclosing tag

1、错误描述babel.min.js:7UncaughtSyntaxError:InlineBabelscript:AdjacentJSXelementsmustbewrappedinanenclosingtag(3:25)1|2| functionPerson(info){>3| return<h1...

2019-05-10 09:55:23

如何使用numpy库获取不同的数组(查看元素)

1、使用arange()生成数组importnumpyasnp;A=np.arange(100);print(A);结果:[01234567891011121314151617181920212223242526272829303132333435363738394...

2019-04-30 22:54:22

如何使用python语言中的numpy库获取矩阵的属性

1、实现源码importnumpyasnp;n=np.array([[21,33,24,35,46,57,78],[20,34,46,57,69,28,12],[63,72,84,95,36,37,28],[19,33,24,13,45,30,41],...

2019-04-30 22:47:15

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