试着用tel:

 maxlength="5" type="tel"

许多人张贴的onKeyDown()事件根本不工作，即你不能删除一旦你达到限制。因此，使用onKeyPress()而不是onKeyDown()，它工作得很好。

下面是工作代码:

用户将不允许输入超过4位数字 < br > <input type="number" pattern="/^-?\d+\.? "\d*$/" onKeyPress="if(this.value.length==4) return false;"/>

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)}/>

最大长度-输入类型文本

<input type="email" name="email" maxlength="50">

使用jQuery:

$("input").attr("maxlength", 50)

最大输入类型号

JS

function limit(element, max) {    
    var max_chars = max;
    if(element.value.length > max_chars) {
        element.value = element.value.substr(0, max_chars);
    } 
}

HTML

<input type="number" name="telefono" onkeydown="limit(this, 20);" onkeyup="limit(this, 20);">

完成了!只有数字和maxlength工作完美。

<input  maxlength="5" data-rule-maxlength="5" style="height:30px;width: 786px;" type="number"  oninput="javascript: if (this.value.length > this.maxLength) this.value = this.value.slice(0, this.maxLength); this.value = this.value.replace(/[^0-9.]/g, '').replace(/(\..*)\./g, '$1');" />

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();