只写

<input type="number" step="0.1" lang="nb">

Lang ='nb"让你用逗号或句号来写小数

试着在输入类型中只允许2个小数

<input type="number" step="0.01" class="form-control"  />

或者使用jQuery的建议@SamohtVII

$( "#ELEMENTID" ).blur(function() {
    this.value = parseFloat(this.value).toFixed(2);
});

输入:

<input type="number" name="price" id="price" required>

脚本:

$('#price').on('change', function() {
    var get_price = document.getElementById('price').value;
    var set_price = parseFloat(get_price).toFixed(2);
    $('input[name=price').val(set_price);
})

使用step="而不是step="any"，因为它允许小数位数任意。“01”，最多允许小数点后两位。

更多详细信息见规范:https://www.w3.org/TR/html/sec-forms.html#the-step-attribute

I had the same requirement but after checking all these answers I realized there is no inbuilt support to block users from typing a particular number of decimal points. step="0.01" is useful when validating the input for a decimal number but still it will not block users from typing any decimal. In my case, I wanted a solution which will prevent user from entering invalid decimal. So I created my own custom JavaScript function which will enforce user any decimal rule. There is a slight performance issue but for my scenario it is okay to have a very small delay to make sure that user is not typing invalid decimal places. It might be useful for someone who wanted to prevent user from typing invalid decimal value on the input.

如果您愿意，可以使用step="0.01"来使用此解决方案。你可以在元素oninput事件上使用下面的函数。如果性能对你来说很重要，那么考虑使用onchange事件而不是oninput。请在data-decimal属性中指定允许输入的最大小数位数。它的值可以从0到任何数字。

function enforceNumberValidation(ele) { if ($(ele).data('decimal') != null) { // found valid rule for decimal var decimal = parseInt($(ele).data('decimal')) || 0; var val = $(ele).val(); if (decimal > 0) { var splitVal = val.split('.'); if (splitVal.length == 2 && splitVal[1].length > decimal) { // user entered invalid input $(ele).val(splitVal[0] + '.' + splitVal[1].substr(0, decimal)); } } else if (decimal == 0) { // do not allow decimal place var splitVal = val.split('.'); if (splitVal.length > 1) { // user entered invalid input $(ele).val(splitVal[0]); // always trim everything after '.' } } } } <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <input type="number" data-decimal="0" oninput="enforceNumberValidation(this)" placeholder="No decimal places" value="" /> <input type="number" data-decimal="2" oninput="enforceNumberValidation(this)" placeholder="2 decimal places" value="" /> <input type="number" data-decimal="5" oninput="enforceNumberValidation(this)" placeholder="5 decimal places" value="" />

我可以使用RegExp来识别无效值，但我还必须恢复输入中的更改。所以我决定不使用RegExp。

使用这段代码

<input type="number" step="0.01" name="amount" placeholder="0.00">

HTML5 Input元素的默认Step值为Step ="1"。