1
<p id="demo">单击按钮显示保留小数的数值</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(2);8
}9
</script>
<p id="demo">单击按钮显示保留小数的数值</p><button onclick="myFunction()">点我</button><script> function myFunction() { var num = 5.56789; var x = document.getElementById("demo"); x.innerHTML = num.toFixed(2); }</script>