input只能输入数字并限制长度

/*在谷歌下移除input[number]的上下箭头*/
.regis_box input[type='number']::-webkit-outer-spin-button,
.regis_box input[type='number']::-webkit-inner-spin-button{
    -webkit-appearance: none !important;
    margin: 0;
}
/*在firefox下移除input[number]的上下箭头*/
.regis_box input[type="number"]{-moz-appearance:textfield;}

<input type="number" oninput="if(value.length>11)value=value.slice(0,11)"class="form-control regis_inp" placeholder="请输入手机号码">