我如何为以下条件写一个开关?
如果url包含“foo”，则设置。Base_url是"bar"。
以下是实现所需的效果，但我有一种感觉，这将更易于管理的开关:
var doc_location = document.location.href;
var url_strip = new RegExp("http:\/\/.*\/");
var base_url = url_strip.exec(doc_location)
var base_url_string = base_url[0];
//BASE URL CASES
// LOCAL
if (base_url_string.indexOf('xxx.local') > -1) {
settings = {
"base_url" : "http://xxx.local/"
};
}
// DEV
if (base_url_string.indexOf('xxx.dev.yyy.com') > -1) {
settings = {
"base_url" : "http://xxx.dev.yyy.com/xxx/"
};
}
独立版本，增加工作安全性:
switch((s.match(r)||[null])[0])
function identifyCountry(hostname,only_gov=false){
const exceptionRe = /^(?:uk|ac|eu)$/ ; //https://en.wikipedia.org/wiki/Country_code_top-level_domain#ASCII_ccTLDs_not_in_ISO_3166-1
const h = hostname.split('.');
const len = h.length;
const tld = h[len-1];
const sld = len >= 2 ? h[len-2] : null;
if( tld.length == 2 ) {
if( only_gov && sld != 'gov' ) return null;
switch( ( tld.match(exceptionRe) || [null] )[0] ) {
case 'uk':
//Britain owns+uses this one
return 'gb';
case 'ac':
//Ascension Island is part of the British Overseas territory
//"Saint Helena, Ascension and Tristan da Cunha"
return 'sh';
case null:
//2-letter TLD *not* in the exception list;
//it's a valid ccTLD corresponding to its country
return tld;
default:
//2-letter TLD *in* the exception list (e.g.: .eu);
//it's not a valid ccTLD and we don't know the country
return null;
}
} else if( tld == 'gov' ) {
//AMERICAAA
return 'us';
} else {
return null;
}
}
<p>Click the following domains:</p>
<ul onclick="console.log(`${identifyCountry(event.target.textContent)} <= ${event.target.textContent}`);">
<li>example.com</li>
<li>example.co.uk</li>
<li>example.eu</li>
<li>example.ca</li>
<li>example.ac</li>
<li>example.gov</li>
</ul>
说实话，你可以做一些
function switchableMatch(s,r){
//returns the FIRST match of r on s; otherwise, null
const m = s.match(r);
if(m) return m[0];
else return null;
}
然后切换(switchableMatch(s,r)){…}
可能太迟了，但我喜欢这个，以防万一。
function extractParameters(args) {
function getCase(arg, key) {
return arg.match(new RegExp(`${key}=(.*)`)) || {};
}
args.forEach((arg) => {
console.log("arg: " + arg);
let match;
switch (arg) {
case (match = getCase(arg, "--user")).input:
case (match = getCase(arg, "-u")).input:
userName = match[1];
break;
case (match = getCase(arg, "--password")).input:
case (match = getCase(arg, "-p")).input:
password = match[1];
break;
case (match = getCase(arg, "--branch")).input:
case (match = getCase(arg, "-b")).input:
branch = match[1];
break;
}
});
};
你可以更进一步，传递一个选项列表，用|处理正则表达式
独立版本，增加工作安全性:
switch((s.match(r)||[null])[0])
function identifyCountry(hostname,only_gov=false){
const exceptionRe = /^(?:uk|ac|eu)$/ ; //https://en.wikipedia.org/wiki/Country_code_top-level_domain#ASCII_ccTLDs_not_in_ISO_3166-1
const h = hostname.split('.');
const len = h.length;
const tld = h[len-1];
const sld = len >= 2 ? h[len-2] : null;
if( tld.length == 2 ) {
if( only_gov && sld != 'gov' ) return null;
switch( ( tld.match(exceptionRe) || [null] )[0] ) {
case 'uk':
//Britain owns+uses this one
return 'gb';
case 'ac':
//Ascension Island is part of the British Overseas territory
//"Saint Helena, Ascension and Tristan da Cunha"
return 'sh';
case null:
//2-letter TLD *not* in the exception list;
//it's a valid ccTLD corresponding to its country
return tld;
default:
//2-letter TLD *in* the exception list (e.g.: .eu);
//it's not a valid ccTLD and we don't know the country
return null;
}
} else if( tld == 'gov' ) {
//AMERICAAA
return 'us';
} else {
return null;
}
}
<p>Click the following domains:</p>
<ul onclick="console.log(`${identifyCountry(event.target.textContent)} <= ${event.target.textContent}`);">
<li>example.com</li>
<li>example.co.uk</li>
<li>example.eu</li>
<li>example.ca</li>
<li>example.ac</li>
<li>example.gov</li>
</ul>
说实话，你可以做一些
function switchableMatch(s,r){
//returns the FIRST match of r on s; otherwise, null
const m = s.match(r);
if(m) return m[0];
else return null;
}
然后切换(switchableMatch(s,r)){…}
