• 效果图
  
• js文件

import $ from 'jquery'

/**
 * 调用键盘
 * @param obj input
 * @param round 小数后几位 0不带小数
 */
export function loadNumberKeyboard(obj, round) {
    if ($("#numberkeyboard").length == 0) {
        let numbtnhtml =
            '<div class="numbtn" key="7"><span>7</span></div><div class="numbtn" key="8">8</div><div class="numbtn" key="9">9</div>' +
            '<div class="numbtn" key="4">4</div><div class="numbtn" key="5">5</div><div class="numbtn" key="6">6</div>' +
            '<div class="numbtn" key="1">1</div><div class="numbtn" key="2">2</div><div class="numbtn" key="3">3</div>' +
            '<div class="numbtn" key=".">.</div><div class="numbtn" key="0">0</div><div class="numbtn " key="backspace">退格</div>';

        $("body").append('<div style="position: absolute; left: 0; top: 0; display: none;"><div id="numberkeyboard">' + numbtnhtml + '</div></div>');
        $("#numberkeyboard").find(".numbtn").bind("mousedown", function () {
            $(this).addClass("numbtndown");
        });
        $("#numberkeyboard").find(".numbtn").bind("mouseup", function () {
            $(this).removeClass("numbtndown");
        });
    }

    let containerDiv = $("#numberkeyboard").parent();
    containerDiv.show();
    containerDiv.css("z-index", 9100);
    obj = $(obj);
    if (obj.attr("id")) {
        var objpadding = parseInt(obj.css("padding-top").replace("px", "")) + parseInt(obj.css("padding-bottom").replace("px", ""));
        if (obj.offset().left + 340 >= $(window).width()) {
            containerDiv.css("left", $(window).width() - 340);
        } else {
            containerDiv.css("left", obj.offset().left);
        }
        if (obj.offset().top + 291 + obj.height() + objpadding + 2 + 5 >= $(window).height() + $(window).scrollTop()) {
            containerDiv.css("top", obj.offset().top - 291 - 5);
        } else {
            containerDiv.css("top", obj.offset().top + obj.height() + objpadding + 2 + 5);
        }
    }
    // 点击键盘外隐藏键盘
    $('html,body')
        .click((e) => {
            let target = e.target;
            if (target.localName !== 'input' && target.className !== 'numbtn') {
                containerDiv.hide();
                $('.numberkeyboard').hide();
            }
        })

    $("#numberkeyboard").find(".numbtn").unbind("click");
    $("#numberkeyboard").find(".numbtn").bind("click", function (e) {

        // obj.focus();
        let key = $(this).attr("key");
        switch (key) {
            case "backspace":
                if (obj.val().length > 0) {
                    obj.val(obj.val().substr(0, obj.val().length - 1));
                }
                break;
            case "sign":
                if (obj.val().length > 0) {
                    if (obj.val().substr(0, 1) === "-") {
                        obj.val(obj.val().substr(1, obj.val().length - 1));
                    } else {
                        obj.val("-" + obj.val());
                    }
                }
                break;
            case "close":
                $("#numberkeyboard").find(".numbtn").unbind("click");
                containerDiv.hide();
                break;
            default:
                let newVar = obj.val() + key;
                if (round === 2) {
                    newVar = newVar.match(/^\d{0,5}(?:\.\d{0,2})?/);
                } else if (round === 3) {
                    newVar = newVar.match(/^\d{0,5}(?:\.\d{0,3})?/);
                } else {
                    newVar = newVar.replace(/[^\d]/g, '')
                }

                obj.val(newVar);
                break;
        }
        // 模拟输入
        obj[0].dispatchEvent(new Event('input'));
    });
}

• css文件

#numberkeyboard {
    background-color: rgb(17, 17, 17);
    height: 295px;
    margin: 0;
    padding: 2px;
    position: relative;
    width: 290px;
    border-radius: 5px;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

#numberkeyboard .numbtn {
    border-radius: 5px;
    height: 68px;
    width: 91px;
    background-color: rgba(91, 91, 91, 0.6);
    color: white;
    margin: 2px;
    line-height: 68px;
    text-align: center;
    font-weight: bold;
    font-size: 25px;
}

#numberkeyboard .numbtn:last-child{
    background-color: red;
    font-size: 20px;
}

#numberkeyboard .numbtn:active {
    background-color: #cccccc;
    color: black;
}

• 使用方式
  
  1.首先再main.js中引入上方的css文件
  2.vue代码中直接使用即可

  <input  placeholder="登录账号 / 员工编号"
         id="username" @focus="getKeyboardNum('username')"
         v-model="loginForm.username"/>

  getKeyboardNum(id) {
    loadNumberKeyboard($("#" + id + ""),0)
  },