Javascript 参数比较赢'；行不通

一切正常-除了这个if-else语句外，一切正常：

    else if ((day = 0 || day = 6) && (hour <= 19)) {
  greeting = "We wish you a nice weekend and a nice " +
  Weekdays[day] + ".";
  }

---

如果（（天=0 | |天=6）和&（小时使用
=
进行比较（通过
值
）和
=
分配值

因此，在您的情况下，应该是：

 ...
 else if ((day == 0 || day == 6) && (hour <= 19)) {
   greeting = "We wish you a nice weekend and a nice " +
   Weekdays[day] + ".";
 }
 ...

你用的是
=
而不是
=
。虽然它应该是
==
而不是
=
@killgar，但我现在查了一下，似乎你可以同时使用这两个。==只是“相等”而===是“严格相等”的
var a = 10; // assigns value 10 to variable `a`

"1"==1      // true => Since == compares by value

"1"===1     // false => Since === compares by both type and value. In this case although value is 1, both are of different types (string and integer)