base64转换为utf-8

js文件中代码如下:

        var Base64toString={
            decode : function (input,utf8){
                var _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
                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);
                    }

                }

                return output;
            }
        }

前端界面中调用：

        <div>{{Base64toString.decode(d.stackMsg,"utf8")}}</div>

即可完成转换。
另附base64在线编码解码地址。base64在线编码解码