1
<p id="demo">单击按钮不保留小数位</p>2
<button onclick="myFunction()">点我</button>3
<script>4
function myFunction() {5
var num = 5.56789;6
var x = document.getElementById("demo");7
x.innerHTML = num.toFixed();8
}9
</script>
<p id="demo">单击按钮不保留小数位</p><button onclick="myFunction()">点我</button><script> function myFunction() { var num = 5.56789; var x = document.getElementById("demo"); x.innerHTML = num.toFixed(); }</script>