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javascript - canvas design mouse drawing function draws multiple parallel colored lines in one stroke

1. The mouse drawing function of canvas design can draw multiple parallel colored lines in one stroke. 2. Tried adding drawing oCg.beginPath(); to the mouse event, but the event will be overwritten. 3. Add a duplicate canvas in the same way, but the canvas is covered.

PHP中文网 2017-06-13 09:24:08

How to create a window to view the generated SQL in Lesson 6-3

There is no green icon to click in the lower right corner of the page I exported.

蓝 2018-06-28 16:09:41

Chartjs legend still not visible even after setting it to true

I'm relatively new to ChartJS and I'm looking for a way to display labels on my donut chart. I tried setting the visibility of the legend to true in the options but still doesn't work. vardata=[{data:[successfulBuildsCount,failureBuildsCount],labels:["success","failure"],backgrou...

P粉595605759 2023-09-14 18:38:17

javascript - How to write jquery to exclude an element and its sub-elements and select all other elements

As shown in the picture, only clicking on the yellow and blue areas will execute the function. Clicking on the red area and the green sub-elements within the red will not execute the function. How to write it with jquery?

伊谢尔伦 2017-05-19 10:44:06

How to change the color of a picture

Could you please tell me, after I scanned this, the color is distorted, how can I adjust it to the original green color? The original picture has the color of the first one, how can I change the second one to the first one?

2021-12-28 11:15:02

javascript - Why are there two activeLinks in vue? I only click on one link. There should only be one activeLink.

New to Vue-. -It took me a long time to figure it out...help me! ! ~~I just want to make three icons under the footer. Click on one icon and that icon will change color, while the other icons will not change color. I saw that after clicking, an active-link is automatically added, and the style is wr...

我想大声告诉你 2017-05-19 10:36:08

javascript - How to center the img element in a div, as shown in the example below

Html code {code...} Example of the desired effect. The red area is div, and the green area is img. That is to say, img is wider. The width of img is not fixed, so it cannot be solved by fixing margin-left.

给我你的怀抱 2017-05-16 13:21:39

javascript - How to switch the sprite image and font color by clicking on the navigation?

As shown in the picture, but there are four pages in the picture. What I want to do now is click on the icon and change the font color on a page. Then the icon is made with a sprite image. Below is a screenshot of the code. It mainly depends on the sprite image.

曾经蜡笔没有小新 2017-05-19 10:43:10

How to make blend mode ignore certain background?

Take a look at the image below: Imagine that the blue rectangle at the bottom, with blend mode: Difference, is slowly moving up to the top. I want it to ignore the red stripe and stay blue when it goes through it, but use the Blend blending mode when it's on the green stripe. How do I do this?

P粉418351692 2023-09-15 10:20:50

javascript - JS and CSS problem, after moving the mouse to an icon on the map, how to center the displayed content relative to the icon.

As shown in the picture below, the right side is the effect I need, that is, when the mouse is moved over the red location icon on the map, the photos and content displayed are centered relative to the location icon below. The left side is the effect I made. The displacement is too serious. Please h...

给我你的怀抱 2017-06-12 09:32:10

javascript - WeChat applet calls external map program

I want to call the Baidu map installed on my mobile phone within the mini program, what should I do? {Code...} This interface can open the built-in map and then click the green button to pop up a list and call the map app installed on the phone. Can the function of this button be implemented by myse...

三叔 2017-07-05 10:38:41

Place interactive markers on images using React

please help. I have an image like the one below that is displayed on the home page (a larger image). Note that the "FORGE" house has a white and blue marker with a black arrow in the middle. The same goes for "rental" homes. Each of these markers will act as an interactive button...

P粉896751037 2023-09-08 21:25:41

How to get the browser viewport size

I want my visitors to be able to see high quality images, is there any way to detect the window size? Or better yet, the browser's viewport size using JavaScript? See the green area here:

P粉237029457 2023-08-28 11:06:30

javascript - How to force a component to refresh in react?

There is an <img src='127.0.0.1/img' /> tag inside the component that loads the image through the URL. It is assumed that an all-white image is initially returned. After the user clicks a button, the background processing image becomes all black. At this time, I hope that the client ca...

漂亮男人 2017-05-19 10:30:06

How to change the background color of the cursor when using vim to view php code?

As shown in the picture, I enabled vim's syntax highlighting and used a custom color theme. When the cursor is on { }, how do I change its background color?

高洛峰 2017-05-16 16:41:28

Need help centering content and making image links clickable

Essentially, I need the image and title to be centered on the screen, but I also need the image to be clickable and open the link. I believe I have the correct code to do this, but I'm still having these two issues. The images also come in two different sizes, so that makes it difficult as well. I j...

P粉794851975 2023-09-13 12:12:49

Fix hover state issues in Tailwind CSS

I'm currently styling a navigation bar for a single page website. When the user hovers over the div surrounding the button, I want it to not only change the background color to a darker green (which already works), but also change the text color to white, making it visible. However, even though I've...

P粉039633152 2023-12-31 08:53:39

javascript - How to implement the collection function without refreshing in php, it is best to have an example~

How to combine php with ajax to realize the collection function without refreshing. It is gray before clicking on an icon and red after clicking. It is best to have an example~Thank you guys~

淡淡烟草味 2017-07-05 10:02:03

Using SVG directly in HTML markup does not allow me to assign the role to a button or have the desired hover effect

I have a container with an icon that is supposed to perform two functions: Act like a button (accessible via keyboard/screen reader etc.) Turn red on hover/focus When I use the SVG directly in the markup, the hover The stop effect works as expected, but I can't assign the button role to the SVG like...

P粉940538947 2023-09-06 20:29:59

How to make borders for columns in table?

I need to make a table like shown in the screenshot: What results I got: Problem: I can't make a green border like in the screenshot of the "Registered" column. Question: If it is a table, how to make this border? I tried overriding it on the div but nothing worked my style.container{table...

P粉176151589 2024-01-16 19:25:40