有什么方法可以将图像转换为javascript中的二进制数据,反之亦然。
我想用JavaScript获取图像数据?回答您的问题:
// Code taken from MatthewCrumley (https://stackoverflow.com/a/934925/298479) function getBase64Image(img) { // Create an empty canvas element var canvas = document.createElement("canvas"); canvas.width = img.width; canvas.height = img.height; // Copy the image contents to the canvas var ctx = canvas.getContext("2d"); ctx.drawImage(img, 0, 0); // Get the data-URL formatted image // Firefox supports PNG and JPEG. You could check img.src to guess the // original format, but be aware the using "image/jpg" will re-encode the image. var dataURL = canvas.toDataURL("image/png"); return dataURL.replace(/^data:image\/(png|jpg);base64,/, ""); }
将img标签传递给此功能。它将以base64编码返回图像。但是它将被重新编码。因此,您无法访问原始图像数据。
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