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strtr是PHP下的一个函数，具体功自己看：https://blog.csdn.net/aidenliu/article/details/5695433
完整JavaScript实现代码摘录如下：
function strtr(str, from, to) {
// https://jsphp.co/jsphp/fn/view/strtr
// + original by: Brett Zamir (https://brett-zamir.me)
// + input by: uestla
// + bugfixed by: Kevin van Zonneveld (https://kevin.vanzonneveld.net)
// + input by: Alan C
// + bugfixed by: Kevin van Zonneveld (https://kevin.vanzonneveld.net)
// + input by: Taras Bogach
// + bugfixed by: Brett Zamir (https://brett-zamir.me)
// + input by: jpfle
// + bugfixed by: Brett Zamir (https://brett-zamir.me)
// - depends on: krsort
// - depends on: ini_set
// * example 1: $trans = {'hello' : 'hi', 'hi' : 'hello'};
// * example 1: strtr('hi all, I said hello', $trans)
// * returns 1: 'hello all, I said hi'
// * example 2: strtr(' aaba ccasde oo', ' ','aao');
// * returns 2: 'aaabaaccasdeooo'
// * example 3: strtr(' ', ' ', 'a');
// * returns 3: 'aaaaaaaa'
// * example 4: strtr('http', 'pthxyz','xyzpth');
// * returns 4: 'zyyx'
// * example 5: strtr('zyyx', 'pthxyz','xyzpth');
// * returns 5: 'http'
// * example 6: strtr('aa', {'a':1,'aa':2});
// * returns 6: '2'
var fr = '',
i = 0,
j = 0,
lenStr = 0,
lenFrom = 0,
tmpStrictForIn = false,
fromTypeStr = '',
toTypeStr = '',
istr = '';
var tmpFrom = [];
var tmpTo = [];
var ret = '';
var match = false;
// Received replace_pairs
// Convert to normal from->to chars
if (typeof from === 'object') {
tmpStrictForIn = this.ini_set('phpjs.strictForIn', false); // Not thread-safe; temporarily set to true
from = this.krsort(from);
this.ini_set('phpjs.strictForIn', tmpStrictForIn);
for (fr in from) {
if (from.hasOwnProperty(fr)) {
tmpFrom.push(fr);
tmpTo.push(from[fr]);
}
}
from = tmpFrom;
to = tmpTo;
}
// Walk through subject and replace chars when needed
lenStr = str.length;
lenFrom = from.length;
fromTypeStr = typeof from === 'string';
toTypeStr = typeof to === 'string';
for (i = 0; i < lenStr; i++) {
match = false;
if (fromTypeStr) {
istr = str.charAt(i);
for (j = 0; j < lenFrom; j++) {
if (istr == from.charAt(j)) {
match = true;
break;
}
}
} else {
for (j = 0; j < lenFrom; j++) {
if (str.substr(i, from[j].length) == from[j]) {
match = true;
// Fast forward
i = (i + from[j].length) - 1;
break;
}
}
}
if (match) {
ret += toTypeStr to.charAt(j) : to[j];
} else {
ret += str.charAt(i);
}
}
return ret;
}代码摘录自：https://www.jsphp.com/javascript/php/fn/view/strtr
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