最近做websocket的测试，需要将收到的数据转换成字符串，在网上找了好几个方法都不好使。同事给了一个函数，测试好用。写笔记记录一下。
funtion ArrayBufferUTF8ToStr(array) {
var out,i,len,c;
var char2,char3;
if (array instanceof ArrayBuffer) {
array = new Uint8Array(array);
}
out = "";
len = array.length;
i = 0;
while(i < len) {
c = array[i++];
switch(c >> 4) {
case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
// 0xxxxxxx
out += String.fromCharCode(c);
break;
case 12: case 13:
// 110x xxxx 10xx xxxx
char2 = array[i++];
out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
break;
case 14:
// 1110 xxxx 10xx xxxx 10xx xxxx
char2 = array[i++];
char3 = array[i++];
out += String.fromCharCode(((c & 0x0F) << 12) |
((char2 & 0x3F) << 6) |
((char3 & 0x3F) << 0));
break;
}
}
return out;
}
