如何发送图像数据进行上传？

Question

这是我的压缩图像代码。我不知道如何发送压缩结果以上传到服务器。这用于codeigniter

var fileReader = new FileReader();
var filterType = /^(?:image\/bmp|image\/cis\-cod|image\/gif|image\/ief|image\/jpeg|image\/jpeg|image\/jpeg|image\/pipeg|image\/png|image\/svg\+xml|image\/tiff|image\/x\-cmu\-raster|image\/x\-cmx|image\/x\-icon|image\/x\-portable\-anymap|image\/x\-portable\-bitmap|image\/x\-portable\-graymap|image\/x\-portable\-pixmap|image\/x\-rgb|image\/x\-xbitmap|image\/x\-xpixmap|image\/x\-xwindowdump)$/i;

fileReader.onload = function (event) {
    var image = new Image();

    image.onload=function(){
        document.getElementById("original-Img").src=image.src;
        var canvas=document.createElement("canvas");
        var context=canvas.getContext("2d");
        canvas.width=image.width/4;
        canvas.height=image.height/4;
        context.drawImage(image,
            0,
            0,
            image.width,
            image.height,
            0,
            0,
            canvas.width,
            canvas.height
        );

        document.getElementById("upload-Preview").src = canvas.toDataURL();
    }
    image.src=event.target.result;
    alert(image.src);
};

var loadImageFile = function () {
    var uploadImage = document.getElementById("upload-Image");

    //check and retuns the length of uploded file.
    if (uploadImage.files.length === 0) { 
    return; 
    }

    //Is Used for validate a valid file.
    var uploadFile = document.getElementById("upload-Image").files[0];
    if (!filterType.test(uploadFile.type)) {
    alert("Please select a valid image."); 
    return;
    }

    fileReader.readAsDataURL(uploadFile);
}    
//Best Regard
//Sabrang