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    var str12 = arrayBufferToBase64(arry);//转换字符串
    console.log(str12);
    var outputImg = document.createElement('img');
    outputImg.src = 'data:image/png;base64,'+str12;
    // // append it to your page
    document.body.appendChild(outputImg);
    console.log(outputImg);
    function arrayBufferToBase64( buffer ) {
        var binary = '';
        var bytes = new Uint8Array( buffer );
        var len = bytes.byteLength;
        for (var i = 0; i < len; i++) {
            binary += String.fromCharCode( bytes[ i ] );
        }
        return window.btoa( binary );
    }