javascript - 用于加载函数的多个 if 语句

Question

我正在尝试制作一个 if 语句，是否需要两个参数才能加载函数，否则应该什么都不会发生。

这里它说form = false OR question.length == 0。但我不需要这个或这个。

查询：

if (form == false || questions.length == 0 ) { 
    alert("You need to create at least one question to create a "+moduleName); 
} else { 
    //do something 
}

它是如何完成的？

Answer 1

逻辑或是|| _ .

逻辑and是&&。

if (form == false && questions.length == 0 ) { 
    alert("You need to create at least one question to create a "+moduleName); 
} else { 
    //do something 
}

Answer 2

if (form == false && questions.length == 0 ) { 
    alert("You need to create at least one question to create a "+moduleName); 
} else { 
    //do something 
}

教程

Answer 3

对 Javascript 中的 AND 子句使用双与号 (&&)：

if (form == false && questions.length == 0 ) { 
   alert("You need to create at least one question to create a "+
} else { 
   //do something 
}

Answer 4

将 OR 更改为 AND -

if (form == false && questions.length == 0 ) { 
    alert("You need to create at least one question to create a "+moduleName); 
} else { 
    //do something 
}