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Upload pictures to get width and height

2022-07-26 13:41:00 【Tangce】 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title> Get the width and height of the uploaded image </title>
</head>
<body>
  <form>
    <input type="file" name="img_upload" id="img_upload" onchange="imgUpload();" />
  </form>
</body>
<script type="text/javascript"> function imgUpload() {
      var file = document.getElementById('img_upload'); createReader(file.files[0], function (w, h) {
      alert(w + ' '+ h)}); } createReader = function(file, whenReady) {
      var reader = new FileReader; reader.onload = function (evt) {
      var image = new Image(); image.onload = function () {
      var width = this.width; var height = this.height; if (whenReady) whenReady(width, height); }; image.src = evt.target.result; }; reader.readAsDataURL(file); } </script>
</html>
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本文为[Tangce]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/207/202207261024001024.html

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