PHP后端base64_encode编码传输前端解码实践

//后端php编码
$res = base64_encode(json_encode($adddata));
return WPreturn($res,1);

//前端利用Base64.decode解码
resdata.data = jQuery.parseJSON(Base64.decode(resdata.data));

//Base64函数方法的实现
function Base64() {
 
   // private property
   _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
 
   // public method for encoding
   this.encode = function (input) {
      var output = "";
      var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
      var i = 0;
      input = _utf8_encode(input);
      while (i < input.length) {
         chr1 = input.charCodeAt(i++);
         chr2 = input.charCodeAt(i++);
         chr3 = input.charCodeAt(i++);
         enc1 = chr1 >> 2;
         enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
         enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
         enc4 = chr3 & 63;
         if (isNaN(chr2)) {
            enc3 = enc4 = 64;
         } else if (isNaN(chr3)) {
            enc4 = 64;
         }
         output = output +
         _keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
         _keyStr.charAt(enc3) + _keyStr.charAt(enc4);
      }
      return output;
   }
 
   // public method for decoding
   this.decode = function (input) {
      var output = "";
      var chr1, chr2, chr3;
      var enc1, enc2, enc3, enc4;
      var i = 0;
      input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
      while (i < input.length) {
         enc1 = _keyStr.indexOf(input.charAt(i++));
         enc2 = _keyStr.indexOf(input.charAt(i++));
         enc3 = _keyStr.indexOf(input.charAt(i++));
         enc4 = _keyStr.indexOf(input.charAt(i++));
         chr1 = (enc1 << 2) | (enc2 >> 4);
         chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
         chr3 = ((enc3 & 3) << 6) | enc4;
         output = output + String.fromCharCode(chr1);
         if (enc3 != 64) {
            output = output + String.fromCharCode(chr2);
         }
         if (enc4 != 64) {
            output = output + String.fromCharCode(chr3);
         }
      }
      output = _utf8_decode(output);
      return output;
   }
 
   // private method for UTF-8 encoding
   _utf8_encode = function (string) {
      string = string.replace(/\r\n/g,"\n");
      var utftext = "";
      for (var n = 0; n < string.length; n++) {
         var c = string.charCodeAt(n);
         if (c < 128) {
            utftext += String.fromCharCode(c);
         } else if((c > 127) && (c < 2048)) {
            utftext += String.fromCharCode((c >> 6) | 192);
            utftext += String.fromCharCode((c & 63) | 128);
         } else {
            utftext += String.fromCharCode((c >> 12) | 224);
            utftext += String.fromCharCode(((c >> 6) & 63) | 128);
            utftext += String.fromCharCode((c & 63) | 128);
         }
 
      }
      return utftext;
   }
 
   // private method for UTF-8 decoding
   _utf8_decode = function (utftext) {
      var string = "";
      var i = 0;
      var c = c1 = c2 = 0;
      while ( i < utftext.length ) {
         c = utftext.charCodeAt(i);
         if (c < 128) {
            string += String.fromCharCode(c);
            i++;
         } else if((c > 191) && (c < 224)) {
            c2 = utftext.charCodeAt(i+1);
            string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
            i += 2;
         } else {
            c2 = utftext.charCodeAt(i+1);
            c3 = utftext.charCodeAt(i+2);
            string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
            i += 3;
         }
      }
      return string;
   }
}

//base64图片上传
$pic = input('post.pic/s','');
preg_match('/^(data:\s*image\/(\w+);base64,)/', $pic, $result); // 可以判断是否是 base64的图片
$type = $result[2];
$extensions = strtolower($type);
if (!in_array($extensions, array('gif', 'jpg', 'png', 'jpeg','bmp'))) {
    return json(['code'=>1,'info'=>'上传的图片不在允许范围内。']);
}
$data= base64_decode(str_replace($result[1], '', $pic));//对截取后的字符使用base64_decode进行解码
//写文件
$tmpStr = 'family'.time().rand(100,9999);
$pic_path='upload/family/'.$tmpStr.'.'.$type;
file_put_contents($pic_path,$data); //写入文件并保存