作者:mobiledu2502879767 | 来源:互联网 | 2023-05-26 14:58
我尝试使用以下函数将JPEG的base64字符串转换为在iOS 8上运行的Cordova /混合应用程序上的blob b64toBlob
.
b64toBlob = function(b64, onsuccess, onerror) {
var img = new Image();
img.Onerror= onerror;
img.Onload= function onload() {
var canvas = document.createElement('canvas');
canvas.width = img.width;
canvas.height = img.height;
var ctx = canvas.getContext('2d');
ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
canvas.toBlob(onsuccess);
};
img.src = b64;
}
但是它给出了一个错误
Uncaught Error: TypeError: undefined is not a function (evaluating 'canvas.toBlob(onsuccess)')
我们什么时候做
var imageData = "data:image/jpeg;base64," + imageData
b64toBlob(imageData,
function(imageBlob) {
uploadBlob(imageBlob)
}, function(error) {
console.log(error)
});
如何解决这个错误?
1> filipvkovic..:
试试这个功能.请注意,dataURI
需要包含base64标头.(例如:"data:image/jpeg;base64,"
)
function b64toBlob(dataURI) {
var byteString = atob(dataURI.split(',')[1]);
var ab = new ArrayBuffer(byteString.length);
var ia = new Uint8Array(ab);
for (var i = 0; i
用法:
...
var blob = b64toBlob(imageData);
var formData = new FormData();
formData.append("source", blob);
...