此JavaScript If语句有什么问题？

Question

I'm trying to build a basic Rock, Paper and Scissors game, can anyone give me a hint as to why this if statement is being rejected.

var rps = function(input1, input2){
    if (input1="paper" && input2="rock") {
        console.log("Player 1 wins!");
    };
};

Answer 1

The equality sign should be == instead of =

var rps = function(input1, input2){
    if (input1=="paper" && input2=="rock") {
        console.log("Player 1 wins!");
    }
};

Answer 2

First of all, comparison is done using == not =

Second of all, remove the semicolon at the end of if.

Answer 3

1. If you want to check ifa variable is equal to a value, you have to use "=="
2. name your function!

3. if-statement doesen't need a semicolon!

   function rsp(input1, input2){ if (input1=="paper" && input2=="rock") { alert("Player 1 wins!"); } };

Answer 4

You're assigning not evaluating. This should make a fun Paper, Rock, Scissors Game:

var prsStatements = {
  paperBeatsRock: 'Paper Beats Rock',
  rockBeatsScissors: 'Rock Beats Scissors',
  scissorsBeatsPaper: 'Scissors Beats Paper',
  seperator: ' - ',
  player1wins: 'Player One Wins!',
  player2wins: 'Player Two Wins!',
  tie: "It's a Tie!"
}
function prs(in1, in2){
  var p = /^paper$/i, r = /^rock$/i, s = /^scissors$/i, in2r = new RegExp(in2, 'i'), prss = prsStatements, sep = prss.seperator;
  if(in1.match(p) && in2.match(r)){
    return prss.paperBeatsRock+sep+prss.player1wins;
  }
  else if(in2.match(p) && in1.match(r)){
    return prss.paperBeatsRock+sep+prss.player2wins;
  }
  else if(in1.match(r) && in2.match(s)){
    return prss.rockBeatsScissors+sep+prss.player1wins;
  }
  else if(in2.match(r) && in1.match(s)){
    return prss.rockBeatsScissors+sep+prss.player2wins;
  }
  else if(in1.match(s) && in2.match(p)){
    return prss.scissorsBeatsPaper+sep+prss.player1wins;
  }
  else if(in2.match(s) && in1.match(p)){
    return prss.scissorsBeatsPaper+sep+prss.player2wins;
  }
  else if(in1.match(in2r)){
    return prss.tie;
  }
}

Now you don't have to worry about case sensitive issues, and your output can be changed!