移除input框type="number"在部分浏览器的默认上下按钮
input::-webkit-outer-spin-button, input::-webkit-inner-spin-button { -webkit-appearance: none !important; margin: 0; }
input::-webkit-outer-spin-button, input::-webkit-inner-spin-button { -webkit-appearance: none !important; margin: 0; }