javascript - 如何获取下载图片的宽高？

Question

我想设置容器的宽度和高度<div>的<img>图片下载后，怎么办？

Answer 1

function fn (div, url_path) {
  var img = new Image();

  img.onload = function () {
    div.style.width = img.width;
    div.style.height = img.height;
  };

  img.src = "url_path";
}

fn(document.getElementsByTagName('div')[0], 'http://some-url-to-image.com/1.jpg');