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楼主的方法转化有些图片会有问题，与后端解析出来的不一致导致接口失败。所以我去网上找到一个新的替代方案，每次都能对得上：
function arrayBufferToBase64(array) {
array = new Uint8Array(array);
var length = array.byteLength;
var table = ['A','B','C','D','E','F','G','H',
'I','J','K','L','M','N','O','P',
'Q','R','S','T','U','V','W','X',
'Y','Z','a','b','c','d','e','f',
'g','h','i','j','k','l','m','n',
'o','p','q','r','s','t','u','v',
'w','x','y','z','0','1','2','3',
'4','5','6','7','8','9','+','/'];
var base64Str = '';
for(var i = 0; length - i >= 3; i += 3) {
var num1 = array[i];
var num2 = array[i + 1];
var num3 = array[i + 2];
base64Str += table[num1 >>> 2]
+ table[((num1 & 0b11) << 4) | (num2 >>> 4)]
+ table[((num2 & 0b1111) << 2) | (num3 >>> 6)]
+ table[num3 & 0b111111];
}
var lastByte = length - i;
if(lastByte === 1) {
var lastNum1 = array[i];
base64Str += table[lastNum1 >>> 2] + table[((lastNum1 & 0b11) << 4)] + '==';
} else if(lastByte === 2){
var lastNum1 = array[i];
var lastNum2 = array[i + 1];
base64Str += table[lastNum1 >>> 2]
+ table[((lastNum1 & 0b11) << 4) | (lastNum2 >>> 4)]
+ table[(lastNum2 & 0b1111) << 2]
+ '=';
}
return base64Str;
} |
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