$('#pm').val(Math.floor(parseFloat(pm*100/100)));
完整代码:
<script type="text/javascript">
function updatePay() {
// Grab all the value just incase they're needed.
var current_price = <?php echo json_encode($current_price); ?>;
var pm = $('#pm').val();
var gg = pm/current_price;
// Set the new input values.
$('#pm').val(Math.floor(parseFloat(pm*100/100)));
$('#gg').val(gg);
}
$('#pm').keyup(updatePay);
$('#gg').keyup(updatePay);
</script>
当我使用Math.floor时,它不允许我输入第二个小数点。
我需要我的代码能够允许填充第二个小数位,如何在 Javascript 中做到这一点?
试试这个
$('#pm').val((Math.floor(parseFloat(pm)*100)/100).toFixed(2));
我想你想四舍五入并允许小数点后 2 位,
所以如果数字是 3546.699433
parseFloat(pm(*100 = 354669.9433
math.floor(354669.9433( = 354669
354669/100 = 3546.69
<script type="text/javascript">
function updatePay() {
// Grab all the value just incase they're needed.
var current_price = <?php echo json_encode($current_price); ?>;
var pm = $('#pm').val();
var gg = pm/current_price;
// Set the new input values.
$('#pm').val((Math.floor(parseFloat(pm)*100)/100).toFixed(2));
$('#gg').val(gg);
}
$('#pm').change(updatePay);
$('#gg').chnage(updatePay);
</script>
如果您想要在 keyup 上更新的内容,请尝试以下操作
Javascript:
document.getElementById("num1").onkeyup = function(){
var val = (Math.floor(parseFloat( document.getElementById("num1").value)*100)/100).toFixed(2);
if(isNaN(val)){
document.getElementById("result").innerHTML = "pm will appear here";
}
else if(val){
document.getElementById("result").innerHTML = val;
} else {
document.getElementById("result").innerHTML = "pm will appear here";
}
}
.HTML:
<body>
<input type="button" id="myButton" value="click me"/>
<span id="result"></span>
<input type="text" id="num1" value="1.1111"></div>
</body>
很难说你想实现什么,但猜测我怀疑你希望以pm
和gg
显示的值具有两位数的小数精度。㞖:
function updatePay() {
// Grab all the value just incase they're needed.
var current_price = <?php echo json_encode($current_price); ?>;
var pm = parseFloat($('#pm').val()); // Parse here
var gg = pm/current_price;
// Set the new input values.
$('#pm').val(pm.toFixed(2)); // Round to two places and turn back into text
$('#gg').val(gg.toFixed(2)); // " " " " " " " " "
}
旁注:您将此设置为gg
元素上的keyup
处理程序,但您始终会覆盖 gg
元素中的内容,而根本不使用 gg
中的值。如果我是用户,我会觉得这很烦人。