我有这个 html 代码:
<div id="wrapper">
<h1> Rock Paper Scissors Bot</h1>
<button id="game-start-button"> Start Game </button>
</div>
我正在尝试使用此 javascript 代码向 <button id="game-start-button"> Start Game </button>
添加事件侦听器:
const wrapper = document.querySelector("#wrapper");
console.log(wrapper);
let gameStartButton = wrapper.querySelector("#game-start-button");
console.log(gameStartButton);
function startGame(){
// fillin
};
gameStartButton.addEventListener("click",startGame);
但是每当我尝试这个时,它都会给我一个错误:Uncaught TypeError: wrapper is null