Category : javascript

Promise is a high-frequency question in front-end interviews. When I was an interviewer, the probability of asking Promise exceeded 90%. As far as I know, most companies would ask some questions about Promise. If you can write standard source code according to the standard of PromiseA+, then I think you can give perfect answers to ..

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Implementation Principle of Pull-down Refresh Implementation of pull-down refresh is mainly divided into three steps: Monitor the native touchstart event and record the value of its initial position, e.touches [0]. pagey; Monitor the native touchmove event, record and calculate the difference between the current sliding position value and the initial position value. when the difference ..

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With the development of the Internet, various Web applications have become more and more complex, meeting various needs of users. At the same time, various network security problems have followed. As front-end engineers, we can’t escape from this problem either. Today, let’s take a look at what security problems exist in the Web front-end and ..

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About [Step-By-Step] If you don’t take too many steps, you’ll reach a thousand miles. Step-By-Step(Click to enter the project) It was me at2019-05-20The beginning of a project, the project vision: one step at a time, quantitative change leads to qualitative change. Step-By-StepOnly face-to-face questions will be issued on weekdays, mainly considering that some of the ..

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