When uploading files, you often need to wait. In this case, you can add progress bars to implement this technology. The following describes how to simulate progress bars using Js. Remember that this is a simulated progress bar, not a real progress bar, for a real progress bar, you need to obtain the actual file size and listen to the file upload size every moment. After obtaining the data, you also need to use JS technology to transmit the data to the front end, it seems that my brother still cannot implement this technology. First, use js to simulate it. In a few days, I will study the real situation of listening to file uploads using PHP, let's take a look at the simulated progress bar (declaring it again is just a simulated, not a real one)
<! Doctype HTML public "-// W3C // dtd html 4.0 transitional // en"> <HTML>
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