为什么 Date().getHours() 有时会返回一个布尔值 True？

Question

I'm using Google Apps Script to try and send automatic emails during business hours. As part of this, I use some of the Date functions to get the current day, hour, minute, etc.

  var nowH=new Date().getHours();
  var nowD=new Date().getDay();
  var nowM=new Date().getMinutes();
  Logger.log('Day: ' + nowD + ', Hour: ' + nowH + ', Min: ' + nowM )

When I run this, it runs fine. For example, it currently returns:

[18-10-04 13:18:02:743 AEST] Day: 4, Hour: 13, Min: 18

So it looks like it's working fine, but when I use my if statements, the timing seems off. I decided to print some of these in the HTML email as well:

+ '<br>Debug: Day: ' + nowD + '  Hour: ' + nowH + '  Min:  ' + nowM

And to my surprise, I get something like:

Debut: Day: 4 Hour: true Min: 18

So it looks like the 'nowH' hour data, has suddenly turned into 'True'. I don't reference nowH any other time before the if-statement or adding this to the email.

Are there any obvious reasons how this might change to a boolean?

Answer 1

As suggested by @Jaromanda X, it was the single = sign which seemed to change the value of 'nowH'.

I tested this by adding a separate logger of the same 3 fields.

Before the change: if(( nowH=10 && nowM > 25 && nowM < 35 && nowD!=6 && nowD!=0 ) || (nowH>=10 && nowH<=17 && nowM <5 && nowM>58 && nowD!=6 && nowD!=0))

[18-10-04 13:47:02:337 AEST] Day: 4, Hour: 13, Min: 47

[18-10-04 13:47:02:338 AEST] Day2: 4, Hour2: false , Min2: 47

After the change: if(( nowH==10 && nowM > 25 && nowM < 35 && nowD!=6 && nowD!=0 ) || (nowH>=10 && nowH<=17 && nowM <5 && nowM>58 && nowD!=6 && nowD!=0))

[18-10-04 13:47:02:337 AEST] Day: 4, Hour: 13, Min: 47

[18-10-04 13:47:02:338 AEST] Day2: 4, Hour2: 13 , Min2: 47