problem scenario: the recently developed Vue project found that the network is too poor, causing the first screen of the page to go blank for nearly 3 seconds. You want to optimize the first screen rendering problem. Optimization scheme: 1 reduce co...
what is the default for css if you do not specify line-height? Is it equal to font-size? Sometimes it feels like setting it manually to be the same as font-size is not the same as letting him not set it by default. ...
question 1: the combined class selector selects the node behind it, so how do you choose the previous one? <a href="https: segmentfault.com" class="p1">This is a paragraph.1< a> <a href="https: segmen...
encounters a problem with first-child
multiple layers are nested with each other, and then use the p:first-child selector, which cannot be selected correctly. Code: <body> 111 222 333 < body> use p:first-child {color:red;} at this time,...
modify the theme file, want to add a comment box, fill it in according to the configuration requirements, then hexo clean g d prompts that there is nothing to update, and the local test does not respond to what to do ...
how to do this: the user scrolls down the page window, triggers an event when div is about to enter the view. Each div location of ps: is different, so you need to trigger flexibly. ...
dude, I used the same request method to request two interfaces, but found that the request headers was different and one of the requests failed this is the request method I encapsulated get(url, params: Object = {}): Observable<HttpResponse> ...
$model = new Test(); $model->uuid = new Expression( UUID() ); $model->create = new Expression( NOW() ); if($model->save() === false) { echo(json_encode($model->getErrors()));exit; } else echo( saved ); the output is shown as:...
such as QPixmap( . res shadow left_top.png ) is used to make the upper left corner of the window shadow, but this requires 8 pictures, can you use different parts of a picture? Similar to the nine palace grid cut chart Thank you ...