使容器内的两个div高度相等(100%)

.container {
  display: flex;
  flex-direction: column;
}

.container div {
  flex: 1;
}

.container {
  display: grid;
  grid-template-rows: 1fr 1fr;
}

var div1 = document.getElementById("div1");
var div2 = document.getElementById("div2");

var maxHeight = Math.max(div1.offsetHeight, div2.offsetHeight);

div1.style.height = maxHeight + "px";
div2.style.height = maxHeight + "px";