最大长度将不能与<input type="number"工作，我知道的最好的方法是使用oninput事件限制最大长度。请看下面的代码。

<input name="somename"
    oninput="javascript: if (this.value.length > this.maxLength) this.value = this.value.slice(0, this.maxLength);"
    type = "number"
    maxlength = "6"
 />

我知道已经有一个答案，但如果你想让你的输入行为完全像maxlength属性或尽可能接近，使用以下代码:

(function($) {
 methods = {
    /*
     * addMax will take the applied element and add a javascript behavior
     * that will set the max length
     */
    addMax: function() {
        // set variables
        var
            maxlAttr = $(this).attr("maxlength"),
            maxAttR = $(this).attr("max"),
            x = 0,
            max = "";

        // If the element has maxlength apply the code.
        if (typeof maxlAttr !== typeof undefined && maxlAttr !== false) {

            // create a max equivelant
            if (typeof maxlAttr !== typeof undefined && maxlAttr !== false){
                while (x < maxlAttr) {
                    max += "9";
                    x++;
                }
              maxAttR = max;
            }

            // Permissible Keys that can be used while the input has reached maxlength
            var keys = [
                8, // backspace
                9, // tab
                13, // enter
                46, // delete
                37, 39, 38, 40 // arrow keys<^>v
            ]

            // Apply changes to element
            $(this)
                .attr("max", maxAttR) //add existing max or new max
                .keydown(function(event) {
                    // restrict key press on length reached unless key being used is in keys array or there is highlighted text
                    if ($(this).val().length == maxlAttr && $.inArray(event.which, keys) == -1 && methods.isTextSelected() == false) return false;
                });;
        }
    },
    /*
     * isTextSelected returns true if there is a selection on the page. 
     * This is so that if the user selects text and then presses a number
     * it will behave as normal by replacing the selection with the value
     * of the key pressed.
     */
    isTextSelected: function() {
       // set text variable
        text = "";
        if (window.getSelection) {
            text = window.getSelection().toString();
        } else if (document.selection && document.selection.type != "Control") {
            text = document.selection.createRange().text;
        }
        return (text.length > 0);
    }
};

$.maxlengthNumber = function(){
     // Get all number inputs that have maxlength
     methods.addMax.call($("input[type=number]"));
 }

})($)

// Apply it:
$.maxlengthNumber();

这也适用于Android

更改输入类型为文本，并使用"oninput"事件调用函数:

<input type="text" oninput="numberOnly(this.id);" maxlength="4" id="flight_number" name="number"/>

现在使用Javascript Regex过滤用户输入，并将其限制为数字:

function numberOnly(id) {
    // Get element by id which passed as parameter within HTML element event
    var element = document.getElementById(id);
    // This removes any other character but numbers as entered by user
    element.value = element.value.replace(/[^0-9]/gi, "");
}

演示:https://codepen.io/aslami/pen/GdPvRY

我有两种方法

首先:使用type="tel"，它将像mobile中的type="number"一样工作，并接受maxlength:

<input type="tel" />

第二:使用一点JavaScript:

<!-- maxlength="2" -->
<input type="tel" onKeyDown="if(this.value.length==2 && event.keyCode!=8) return false;" />

这段代码对我来说运行得很好。

在type="number"的输入中，可以添加以下属性:

oninput="constrainUserInput(this.id)"

完整的输入是这样的:

<input type="number" class="test_css" maxlength="4" oninput="constrainUserInput(this.id)" id="flight_number" name="number"/>

注意:必须为这个方法分配输入和ID

然后你可以添加以下JavaScript到你的HTML，它基本上替换任何字符超过你的maxlength属性用一个空引号(本质上删除它们):

function constrainUserInput(id) {
  let input = document.getElementById(id);
  let value = input.value;
  if (value.length > input.maxLength) {
    input.value = value.substring(0, input.maxLength);
  }
}

对于React用户，

只需将10替换为您的最大长度要求

 <input type="number" onInput={(e) => e.target.value = e.target.value.slice(0, 10)}/>