Javascript如果条件与多个OR和AND [英] Javascript If Condition with multiple OR and AND

问题描述

请看看我的情况。
我只是刷新我的JavaScript，我想知道如何检查，如果插入的变量是我想要使用的。

显然如果（选择1和选择2等同于石头或剪刀或纸）{$

现在if条件说明，如果b $ b做到这一点;
} else {做别的事情}

但显然它不符合我的要求。

  var choice1 = prompt（Player 1：Rock，scissors or paper？）; 
 var choice2 =提示（玩家2：摇滚，剪刀或纸？）; 
 
比较（choice1，choice2）; 
 
函数比较（choice1，choice2）{
 
 if（choice1&& choice2 ===rock||paper|| scissors）{
 alert（你通过）; 
} else {
 alert（出错了）; 
} 
  

任何人都可以给我一个简短的解释，为什么if条件通过每个值获得？它永远不会显示消息出错了。

解决方案

我相信它看起来像：

  if（（choice1 ==rock|| choice1 ==paper|| choice1 ==scissors）&& 
（choice2 ==rock|| choice2 ==paper|| choice2 ==scissors））{... 
  

please have a look on my if condition. I am just refreshing my javascript and I am wondering, how I could check, if the inserted variables, are the ones I want to be used.

Obviously the "game" should only take rock, paper or scissors.

Now the if condition says, if (choice 1 and choice 2 equal rock or scissors or paper) { do this; } else {do something else}

But apparently it is not working the way I want.

var choice1 = prompt("Player 1: Rock, scissors or paper?");
var choice2 = prompt("Player 2: Rock, scissors or paper?");

compare(choice1, choice2);

function compare(choice1, choice2) {

if(choice1 && choice2 === "rock" || "paper" || scissors) {
    alert("You pass");
} else {
    alert("Something went wrong");
}

Could anyone give me a short explanation, why the if condition passes every value it gets? It never shows the mssage "Something went wrong".

解决方案

I believe it shoud look like:

if ((choice1=="rock" || choice1=="paper" || choice1=="scissors") && 
    (choice2=="rock" || choice2=="paper" || choice2=="scissors")){...

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