uniapp 图片base64格式转blob格式方法

parseBlob:function(base64) {

var arr = base64.split(',');

var mime = arr[0].match(/:(.*?);/)[1];

var bstr = atob(arr[1]);

var n = bstr.length;

var u8arr = new Uint8Array(n);

for(var i = 0; i < n; i++) {

u8arr[i] = bstr.charCodeAt(i);

}

var url = URL || webkitURL;

return url.createObjectURL(new Blob([u8arr], {type: mime}));

},