How to implement -toDataURL() function in node.js

问题:

I am a newbie using webgl implementation as a dependent module for my project. I am trying to use .toDataURL() function using node-webgl wrapper at server side. But I get an error station .toDataURL() is undefined. For more detail, please have a look at this link: canvas.toDataURL() is not a function - error node-webGL wrapper

Well the current post is definitely not a duplicate. In the post(earlier link shared) I am trying to find an alternative way to access the data of canvas. The goal of this current post is to implement the .toDataURL() function. I am novice in these webgl. Could you please share some links or procedure on how to implement this small function. or Could I access the same function of browser implementation(copy it here), where can I get that?

Any suggestions will definitely be helpful.

Thank You.

回答1:

A data URI consists of:

data:[<media type>][;base64],<data>

All you need to do is concatenate:

1. a string "data:"
2. a media type - e.g. "image/jpeg"
3. a string ";base64,"
4. Base64 representation of your data

For more info see:

• https://en.wikipedia.org/wiki/Data_URI_scheme
• https://en.wikipedia.org/wiki/Base64

There are several modules on npm that can help you generate Base64:

• https://www.npmjs.com/search?q=base64

This is basically everything that you need to know to implement toDataURL() function.