将图像转换为javascript中的二进制数据[重复]

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-enpre the image.    var dataURL = canvas.toDataURL("image/png");    return dataURL.replace(/^data:image/(png|jpg);base64,/, "");}

将

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