解决方法@H_404_4@

可以使用模式属性： http://jsfiddle.net/887saeeg/对输入实现仅HTML数据验证.结合：有效和：无效伪类,可以仅使用表示技术来获得良好的错误检查功能.当然,需要现代浏览器. (我在功能性CSS系列丛书的最后一卷[亚马逊上提供]中详细介绍了仅限浏览器的验证).

HTML：

<form>
    <input type = "text" placeholder = "Phone or Email" required pattern = "^([a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,3})|(\d{3}-\d{3}-\d{4})$"/>
    <input type = "submit" value = "Send" />
</form>

编辑：使用CSS伪类的示例：http://jsfiddle.net/292pp5gk/.

HTML：

<form>
    <label>
        <input type = "text" placeholder = "Phone or Email" required pattern = "^([a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,3})|(\d{3}-\d{3}-\d{4})$"/>
        <span class = "error">Please provide a valid telephone or email</span>
    </label>
    <input type = "submit" value = "Send" />
</form>

CSS：

label {
    position: relative;
}

.error {
    position: absolute;
    white-space: nowrap;
    bottom: -8px;
    left: 0;
    transform: translateY(100%);
    display: none;
    background-color: hsla(0,50%,70%,1);
    padding: 5px 10px;
    border-radius: 5px;
    font: normal 12px/1 Sans-Serif;
}

.error:before {
    content: "";
    position: absolute;
    border-style: solid;
    border-color: transparent transparent hsla(0,1) transparent;
    border-width: 0 5px 5px 5px;
    left: 15px;
    top: -5px;
}

input {
    outline: 0;
}

input:invalid + .error {
    display: block;
}