file轉base64
/**
* 上傳附件轉base64
* @param {File} file 文件流
*/
export const fileByBase64 = (file, callback) => {
var reader = new FileReader();
// 傳入一個參數對象即可得到基於該參數對象的文本內容
reader.readAsDataURL(file);
reader.onload = function (e) {
// target.result 該屬性表示目標對象的DataURL
console.log(e.target.result);
callback(e.target.result)
};
}
base64轉blob
/**
* base64轉Blob
* @param {*} data
*/
export const base64ByBlob = (base64, callback) => {
var arr = base64.split(','), mime = arr[0].match(/:(.*?);/)[1],
bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
while (n--) {
u8arr[n] = bstr.charCodeAt(n);
}
console.log(new Blob([u8arr], { type: mime }))
callback(new Blob([u8arr], { type: mime }))
}
blob轉url
var url = window.URL.createObjectURL(blob)
es6使用例子
fileByBase64(file, (base64) => {
base64ByBlob(base64, (blob => {
console.log(blob, 'blob')
var url = window.URL.createObjectURL(blob)
console.log(url, 'url')
})
})