What is the function of html5 web workers?
In this article, the editor introduces "what is the role of html5 web workers" in detail, the content is detailed, the steps are clear, and the details are handled properly. I hope this article "what is the role of html5 web workers" can help you solve your doubts.
Web worker is a JavaScript that runs in the background and does not affect the performance of the page.
When a script is executed in a HTML page, the state of the page is unresponsive until the script is complete.
Web worker is a JavaScript that runs in the background, independent of other scripts, and does not affect the performance of the page. You can continue to do whatever you want: click, select, and so on, while web worker is running in the background.
Internet Explorer 10, Firefox, Chrome, Safari and Opera all support Web workers.
The following example creates a simple web worker that counts in the background:
Demo_workers.js file code:
Before you create a web worker, check if the user's browser supports it:
Now, let's create our web worker in an external JavaScript.
Here, we create a count script. The script is stored in the "demo_workers.js" file:
The important part of the above code is the postMessage () method, which is used to return a message to the HTML page.
Note: web worker is not usually used for such simple scripts, but for tasks that consume more CPU resources.
We already have the web worker file, and now we need to call it from the HTML page. / p >
The following code detects whether worker exists, and if not,-it creates a new web worker object and then runs the code in "demo_workers.js": / p >
If (typeof (w) = = "undefined")
{
W=new Worker ("demo_workers.js")
}
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