国产精品自产高潮在线_ 利用canvas合并圖片

function merger(imgs,maxWidth){
    if(!imgs) 
        return null;
     
    maxWidth = maxWidth || 500;
     
    var height = 0;
    for (var i = 0; i < imgs.length; i++) {
        var img = imgs[i];
        if (img.width > maxWidth) {
            height += img.height * (maxWidth / img.width);
            continue;
        }
        height += img.height;
    }
     
    var canvas = document.createElement("canvas");
    canvas.width = maxWidth+10;
    canvas.height = height+10;
    var ctx = canvas.getContext("2d");
     
    var dheight = 10;
    for (var i = 0; i < imgs.length; i++) {
        var img = imgs[i];
        var cheight = img.height;
        var cwidth = img.width;
        if (cwidth > maxWidth) {
            cwidth = maxWidth;
            cheight = img.height * (maxWidth / img.width);
        }
         
        ctx.drawImage(img, 10, dheight, cwidth, cheight);
        dheight += cheight;
    }
     
     
    var dataurl = canvas.toDataURL('image/png');
    return dataurl;
}

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