directly above the picture, how to take this top value ...

the only thing I can think of now is to save the current canvas to an array every time I finish drawing, and then take it out of the array when I undo it ...

sometimes normal and sometimes abnormal, use document.body.scrollTop = document.body.scrollHeight;; on the contrary, input will not be pushed up. Can you give me some advice? Thank you when the keyboard pops up, there is a value in document.body....

hover flashes when you move it up. ...

recently encountered a problem, in the cat s eye movie official website to see the normal display of numbers on the page, but to check the source code is a white box, can anyone solve the problem? screenshots of some cat s eye movie pages: ...

the scheduling page clicks the order to enter the order details. When you return to the scheduling page, you will request data rendering again. Now you want to return to the previous page without rendering. cannot be cached using keep-alive, and activa...

use canvas to draw a chart, but how to implement an adaptive browser ...

recently, if you want to make a table, you need to fix the header and display the first two columns, because the table has a large number of columns, and the width of the table is more than 7000 px. then I have to do fixed two-column positioning. Calcul...

there is a demand for the product, and there is no good solution after thinking about it, so I turn to you for help. no, no, no. the requirement is like this: an element (width and height is not fixed, defined according to browser width and height) cont...

A novice at the front end, who knows about html and css for about a month and a half, wants to ask the gods to take a look at it. There is such a page as the first screen, text plus pictures, the first half of the text is fixed, the second half is t...

jq gets the date and week of the last seven days, for example: ...

< H2 > encounter an image track that needs to be similar to the figure in a project < H2 > what UI should be used for video tracks like this in the front end, and what common libraries are there < H1 > Thank you! < H1 > ...

The framework is an iview,table component that renders the colorpicker component with the render function. However, an error is reported, indicating that the component is not registered. Code on I commented out the render function, and the compon...

1. Recently, I have been doing a WeChat Mini Programs with such an interface . ,text: Model: OPPOR11S 2. Code: < view style= background-color:white;margin-top:20rpx;margin-bottom:40rpx;height:88rpx;width:100%;display:flex; > < text style= ...

suddenly came up with a question: can I use the false of confirm to cancel the switching of option under select? ` < select name= " " id= "sel " > <option selected value="">coder s life< option> <option value=""&g...

can Wechat Xiaocheng tcp link to intranet devices? ...

how to use flv.js to make a live video http-flv vue? ...

We found that sometimes browsers get stuck, especially in the case of a code loop, so we wonder if there is JS code running. at present, we have two ways to judge: 1. Add console.log output everywhere, and then see if the output is continuous 2. Che...

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now I need to realize the effect of flipping books in a single-page mobile application based on vue. Can I only play pictures? can I put the introduced components ?...