Project background: the project uses gulp sass
problem requirements: gulp.spritesmith is used to synthesize sprite images; but the problem is: every time a new png; is re-merged, the previous image location information will change;
want: each new picture; automatically append to the last sprite image; does not affect the previous location
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above is an audio plug-in wavesurfer.js. There is a gray progress bar below. Now click anywhere in the progress bar to create a div (red circle area) at the current location. Click x to delete the div, and drag the two-way arrow to drag back and forth, ...