Question

js怎么将图片转成二进制数据 base64 是什么进制

Answer 1

function convertImgToBase64(url, callback, outputFormat){
    var canvas = document.createElement('CANVAS'),
        ctx = canvas.getContext('2d'),
        img = new Image;
    img.crossOrigin = 'Anonymous';
    img.onload = function(){
        canvas.height = img.height;
        canvas.width = img.width;
        ctx.drawImage(img,0,0);
        var dataURL = canvas.toDataURL(outputFormat || 'image/png');
        callback.call(this, dataURL);
        canvas = null; 
    };
    img.src = url;
}
 
//图片地址 
var imagePath='image.png';
convertImgToBase64(imagePath, function(base64Img){
    // Base64DataURL
});