grid-template-columns: repeat(50, 10px);
grid-template-rows: repeat(50, 10px);
<button id="start">开始</button>
<button id="stop">停止</button>
<button id="reset">重置</button>
var grid = document.getElementById("grid");
var startButton = document.getElementById("start");
var stopButton = document.getElementById("stop");
var resetButton = document.getElementById("reset");
for (var i = 0; i < 50; i++) {
for (var j = 0; j < 50; j++) {
var cell = document.createElement("div");
cell.addEventListener("click", toggleCell);
var row = this.dataset.row;