By default, if an object (source) is drawn on top of another object (target) in Canvas, the browser will simply overlay the image of the source object on top of the image of the target object. To put it simply, in Canvas, the image source and target image
A JS interview question from a company in 2008. The position was a JavaScript engineer (going to Google). The interviewer asked me how to clone an array. At that time, I thought about it. The Object of js does not have a clone method, but the Object of ja
1. Local variables are used first and then declared, which does not affect the external variables with the same name. The code is as follows: var x = 1; // --> external variable x function fn(){ alert(x); // --> undefined local variable x first uses
It requires hybrid App development, native shell + webApp, which calls the native camera function in the web part and displays the camera content in the designated area of the web page. At the same time, you can manually take photos and perform face rec
X-UA-Compatible is a new setting for ie8. It is not recognized by browsers other than ie8. This difference is the same as content=”IE=7″, regardless of whether the page contains<!DOCTYPE> instruction,
CSS Hack is a remedy that is used when standard CSS is not compatible with the display effects of various browsers. Until browser manufacturers reach an agreement on how to parse CSS, we can only use this method to complete such tasks. You may be able to
Many times we need to limit the type of input content in the text box when making forms. Below we use regular expressions to limit the text box to only input numbers, decimal points, English letters, Chinese characters and other codes.
No matter what version of IE browser it is, it is always somewhat incompatible with Web standards. For code workers, it is naturally miserable. In order to consider the compatibility issue of IE, whether writing CSS or JS, IE is often treated specially, w
it is known<pre> Tags define preformatted text, and a common application is to represent computer source code. Text enclosed in a pre element usually preserves spaces and newlines, but unfortunately, when you<pre> When writing code in a tag, if you do not
