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js garbage collection The Javascript of the browser has an automatic garbage collection mechanism (GC). The garbage collector will periodically (periodically) find out those variables that are no longer in use, and then release their memory. However, this process is not real-time, because it is expensive and stops responding to other operation ...

This paper focuses on three issues prototype and proto function and object What happened to new prototype and proto First of all, let's talk about what puzzles us in JS, that is, prototype and__ proto__ What the hell is it __ proto__ Is the so-called prototype in Javascript (here, let's take a specific example to illustrate it) function ...

In the process of automated testing, when you start the browser through selenium, you may need to load plug-ins (such as firebug for testing, or a plug-in must be added in the product), read user data (your own browser configuration file / browser configuration file directly given by others), and set the browser (do not load pictures, etc.). S ...

01. JS processing scroll bar Execute via webdriver_ The script () method executes the JS script operation scroll bar Right scroll bar Firefox browser and Chrome browser use different syntax. It is listed in the following area. It looks like Google browser 71 general Firefox # Firefox browser scrolls to the bottom js = "var q=document.docume ...

The learning resources for this article come from "Graphics, Animation and Game Development of HTML5 Canvas Core Technologies" Try not to use setInterval and setTimeout to animate, but rather use the requestAnimationFrame() method to let the browser decide the frame rate on its own. Because browsers differ in the implementation of ...

canvas tags for HTML5 preface text What is canvas Basic use of canvas canvas element Rendering context Test support canvas drawing concept Coordinate space Draw rectangle Draw path Draw arc arc example 1 arc example 2 arc example 3 Add canvas style fillStyle strokeStyle Draw text Add text sty ...

Mouse events Mouse events are included in the ActionChains class. When importing, you only need to: from selenium.webdriver.common.action_chains import ActionChains Import the class to: Common methods are: context_click() -- right click double_click() -- double click drag_ and_ Drop - drag move_to_element() -- mouse over an element cl ...

1.hasClass() //Determine whether a class exists function hasClass(element, value) { var cls = value || ''; //\s Matches any white space characters, including spaces, tabs, page breaks, and so on if (cls.replace(/\s/g, '').length == 0) { return false; //Returns false when no parameter is returned ...

After successful login, automatically kick off the previous login user. Songge first saw this feature inside the button. It was fun at that time. Once you've done your own development, you've met the same requirements. Just as the recent Spring Security series is being serialized, you can use Spring Security to talk about how this function work ...

Previously, there was a bug like this when you logged in. When you click on the sign-in browser will prompt you to "save password". Then if the user accidentally clicks on this "save" when they go online in a field such as an Internet cafe, it will be troublesome. After shutting down and leaving, the ...