JavaScript格式编号始终显示2个小数位

(Math.round(num * 100) / 100).toFixed(2);

现场演示

var num1 = "1";document.getElementById('num1').innerHTML = (Math.round(num1 * 100) / 100).toFixed(2);var num2 = "1.341";document.getElementById('num2').innerHTML = (Math.round(num2 * 100) / 100).toFixed(2);var num3 = "1.345";document.getElementById('num3').innerHTML = (Math.round(num3 * 100) / 100).toFixed(2);span {    border: 1px solid #000;    margin: 5px;    padding: 5px;}<span id="num1"></span><span id="num2"></span><span id="num3"></span>

请注意，它将 四舍五入 到小数点后两位，因此输入

1.346

1.35