<!DOCTYPE html>
<html>
<body>
<p>单击按钮将数字 1.6 向下舍入到最接近的整数。</p>
<button onclick="myFunction()">试一试</button>
<p id="demo"></p>
<script>
function myFunction() {
document.getElementById("demo").innerHTML = Math.floor(1.6);
}
</script>
</body>
</html>