前端上传图片 base64转二进制上传

var dataURItoBlob = function (dataURI) {
        var byteString = atob(dataURI.split(',')[1]);
        var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0];
        var ab = new ArrayBuffer(byteString.length);
        var ia = new Uint8Array(ab);
        for (var i = 0; i < byteString.length; i++) {
            ia[i] = byteString.charCodeAt(i);
        }
        return new Blob([ab], {type: mimeString});
    },
var fd = new FormData(),
var fname = (new Date().getTime()) + parseInt(Math.random() * 1000, 10) + ".jpg",
var blob = dataURItoBlob("data:image/jpg;base64," + that.imgEditerPlugin.encodeBase64());

fd.append("file", blob, fname);
$.ajax({
    contentType: false,
    cache: false,
    url: uploadUrl,
    type: "POST",
    processData: false,
    data: fd
}).then(function(){
);