Tag：shortcoming
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Time：2021-1-25
Mobile terminalwebProblems encountered in development: the UI draft requires setting the border to1px, CSS settingsborder: 1px solid #eee;After that, the UI said the border was too thick. that is becausedevicePixelRatioThis is caused by the characteristics. CSS settings1pxyesCSS pixelAnd the UI draft refers toDevice pixelThere is a proportional relationship between them,devicePixelRatio. IPhonedevicePixelRatio == 2, andborder-width: 1pxIt […]
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Time：2021-1-23
Two column layout (one side fixed width, one side adaptive), should be used frequently in work, can be said to be the front-end foundation. In an interview, however, interviewer: write down all the ways you can think of two column layout on paper. I thought: it’s not easy. Think about it… Suddenly! Don’t say much, […]
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Time：2021-1-10
catalog The difference between async and ordinary function await Async / await handles multiple callbacks asynchronously Async and await must be used together On the handling of errors in using await M1：try-catch M2：.catch M3: two return values (refer to node) Es6-es10 learning map The difference between async and ordinary function //Ordinary function function fuc() { […]
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Time：2020-12-22
1.params <Route path=’/path/:name’ component={Path}/> <link to=”/path/2″>xxx</Link> this.props.history.push({pathname:”/path/” + name}); To read parameters: this.props.match . params.name Advantage: refresh address bar, parameters still existDisadvantages: you can only pass strings, and if you pass too many values, the URL becomes long and ugly. 2.query <Route path=’/query’ component={Query}/> <Link to={{ path : ‘ /query’ , query : { name […]
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Time：2020-12-9
Telestate feature 1. State sharing of hooks API. 2. The state can be changed outside the component through dispatch 3. No provider is required, regardless of whether the component is in the scope of provider. 4. The volume is only 4K 5、typescript friendly. shortcoming Class components are not supported at the moment, so you need […]
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Time：2020-11-26
1. Float + margin (floating layout) <template> <div class=”container”> <div class=”left”>Left</div> <! — the right should be written in the middle — > <div class=”right”>Right</div> <div class=”main”>Main</div> </div> </template> <style scoped> html,body, .container { height: 100%; width: 100%; margin: 0; padding: 0; } /*Left floating*/ .left { float: left; height: 100%; width: 200px; background: #e056fd; […]
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Time：2020-11-16
Cache penetration is to request a large number of data that does not exist originally, such as request a data. At this time, if there is no data in the cache, it will be queried from the database, but the database has no value, so when it returns null, the cache still has no data. […]
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Time：2020-11-11
Advantages of MVC: 1. Ease of use: the smallest amount of code compared with other modes. Many people are familiar with it, so it’s easier to maintain even for less experienced developers. Disadvantages of MVC: 1. Poor testability 2. More and more bulky controller Advantages of MVVM: 1. Easy to test 2. Easy […]
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Time：2020-11-8
preface There are two ways to realize data structure, one is sequential storage, the other is chain storage Sequential storage: the use of a continuous piece of logical address to store dataChained storage: use a pointer to the address of the next element instead of a continuous address Common data structures are: linear table, stack, […]
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Time：2020-10-11
background Some APIs of the platform need to ensure the idempotency of the interface, so as to prevent resource waste caused by frequent API brushing, or the impact of message retransmission. Explanation of terms InterfaceidempotentWhen an operation is repeated N times, the result (side effect) is equal to that of one operation. For example, in […]
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Time：2020-10-5
In our work, we have the following ways to collect user input Input field, single line, overall style, plain text. Textarea input box, multi line, overall style, plain text. Contenteditable, multiline, independent style, rich text. Other rich text editors, multi line, independent style, rich text. If you don’t want to use such a heavy rich […]
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Time：2020-9-15
preface [TOC] Generally speaking, the status code of an HTTP request only indicates whether there is a problem with the request, but it can not indicate where the error is. For example, the user is just a business problem and needs to give a warning, but the HTTP status code can not indicate the business […]
