Javascript JS替换使用相同的短语

如果字符串包含相同的短语，如何替换该字符串

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

活动2

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

中的

site.com

位，因此它不匹配

更干净的方式

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

或

---

首先替换为最长的比赛？很简单：）谢谢

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