Specific steps to use canvas to compress images

Steps to use canvas to compress images:

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1. Get Picture element

2. Draw a blank canvas

3. Draw the picture on the canvas

4. Convert the canvas to base64 (the method called here can achieve compression , base64 can be directly put into src or passed to the backend, converted to other formats for transmission, etc.)

Code implementation:

      
    //待会压缩完的图片放入这里。   

Effect comparison:

Before compression

After compression:

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