div displays the file name, and x is the I tag. Now when the mouse is over I, I need to modify the background color of div, but there is no way to select the previous element, , or can I select the first child element div in the parent div ...
I want to know where the top red box style comes from. I didn t add the style. because the top:100px is set, the top:300px of the following elements does not work. But changing the value of the above top element on the browser can achieve the effect,...
I wrote a page to swipe up and down the page, and when I put my finger in the div range with content in the middle, I disabled the touchmove event, using { e.preventDefault() ...
Mini Program can see the circle on the developer tool, but not on the preview on the phone! You can only see the coordinate points picture description ...
similar effect: question: the width of the parent element adapts to the width of the browser window, so how are the child elements evenly distributed horizontally (including the left and right margins)? requires compatibility with ie8 regardless of...
the data given by the backend is as follows: data:[ { id:1, name:"", checked:true, children:[ { id:11, name:"", checked:true ...
check there are many videos on my site that need to be added , but this leads to a slow opening of my network is there any way to make it faster? https: www.pexels.com has a lot of videos like this , but he can also finish it in seconds or even fa...
The effect of the 1px bottom border set by is as follows is confused. It will be clear after I adjust the screen by 200%. What s the problem? ...
what is reported in the developer s tool is "downloadFile:fail Error: unable to verify the first certificate " what is previewed on the mobile phone is: downloadFile: fail ssl handshark error ask Daniel for advice! ...
After canvas inserts a picture, operations such as rotation and magnification need to be carried out, and the track will be recorded by hand on the basis of the operation. The problem is that the rotation and magnification operation will change the ori...
1. Code: 2.: 3. Question: Why do text boxes and buttons misalign naturally? what is the reason? there is no need to answer the solution. I just want to know why ? ...
if it s HTML rendering, I know how to use it, but the project needs to use the elementUI framework, and a lot of things are packaged. filters: { statusFormat: function(value) { if( value == 1){ return ; } ...
stylus does not listen on styl files node version 8.11.1 stylus version 0.54.5 also do not report an error, I did not respond after I changed the styl code ...
with link how to implement this kind of animation? whether there is a reference source.. ...
handleSave = () => { const syncShow = <svg xmlns="http: www.w3.org 2000 svg" version="1.1" width="100" height="100"> <circle cx="50" cy="50" r="40" stroke="blac...
I have done a mobile function to simulate scrolling. The scrolling container contains pictures arranged vertically. At the beginning, I wrote the width and height of the pictures in css. Because the simulated scrolling needs to obtain the height of the c...
style part .aa{position:absolute;transition:top 2s;} html part <div id="ele" class="aa">< div> js part var ele=document.getElementById( ele ) ele.onclick=function(){ ele.style.top=0 ele.style.top=100+ px se...
<style> .a{ font-size: 100px; position: relative; } .b{ position: absolute; color: red; top: 0; left: 0; } < style> <s...
such as the question, has added servicewechat.com to the whitelist of Qiniuyun; but it still cannot be played in iOS WeChat Mini Programs; it can also be played in ordinary src iOS; playing audio with hotlink protection has no problem with d...
The orange is the parent element, and the pink one is the built-in child element . The window is large enough for one line. the code is as follows <head> <style type="text css"> .box{ display: inline-...
there is a requirement to remove an element from the array when it exists, and to add the element to the array when it does not exist. this is how I implement it. Is there a more elegant or convenient way to write it? Please do not hesitate to give us ...
there is too much space on the right, why can t the width be set? answer ...
I have a small project I did before. At that time, react was still 15 + version. Now I want to update the version to the latest 16. How to modify it? change the number directly in package.json, delete node_module, and re-npm install it? ...
the self-built code management background writes a web hook, which is triggered after the code is submitted, but an error is reported as follows: Delivery: Post http: 127.0.0.1:3116 git: dial tcp 127.0.0.1 Delivery: Post 3116: getsockopt: connection...
$validator = Validator::make($request->all(), [ id => required|integer title => required|unique:posts|max:255 , body => required , ]); The requirement is like ...