JavaScript更新2MB JSON文件

Question

How to update a 2MB JSON file using JavaScript?

I use phonegap to develop an Android application. Now, I need retrieve data from a JSON file and then update data back into this JSON file.

It shows me that the " JavaScript execution exceeded timeout "

Answer 1

Most JavaScript engines have an execution limit, meaning that they will throw an error when your code runs for longer than x seconds. In most browsers, this is just 5 or 10 seconds. Have a look at this answer on SO for more information.

Three solutions come to mind:

• Break up the long-running code in smaller pieces. Rewrite your algorithm so it works in short "spurts" and use setInterval or setTimeout to call the code in iterations.
• Use Web Workers , which are specifically designed for long-running tasks. The downside? Browser compatibility is only so-so.
• Run it on a server . This may be either trivial or nearly impossible, depending on your problem.