JS 使用相同的短语替换

Question

如果包含相同的短语，如何替换确切的字符串？

var campaign = "sub.site.com";
campaign = campaign.replace("site.com", "campaign 1");
campaign = campaign.replace("sub.site.com", "campaign 2");
output = [{campaign: campaign}];

在这种情况下，输出为sub.campaign 1。我希望它是campaign 2.

Answer 1

var campaign = "sub.site.com";
campaign = campaign.replace("site.com", "campaign 1");// campaign = 'sub.campaign 1'
campaign = campaign.replace("sub.site.com", "campaign 2"); //there is no instance of 'sub.site.com' in 'sub.campaign 1'
output = [{campaign: campaign}];

您正在替换sub.site.com的site.com位，因此它不匹配

更清洁的方式

var campaign = "sub.site.com";
if(campaign === 'site.com') {
output = [{campaign: 'campaign 1'}];
}
else if(campaign === 'sub.site.com') {
output = [{campaign: 'campaign 2'}];
}

或

switch("sub.site.com"){
case 'site.com':
output = [{campaign: 'campaign 1'}];
break;
case 'sub.site.com':
output = [{campaign: 'campaign 2'}];
break;
default:      
}