效果图：

代码展示

// 我这边用的是elementUI表单校验，更改的样式。
<el-form:model="form":rules="rules"ref="fromList":hide-required-asterisk="true"><el-form-item prop="account"><div class="input-data"><el-input required="" v-model="form.account" autocomplete="on"></el-input><label>手机号/邮箱</label></div></el-form-item><el-form-item prop="pass"><div class="input-data"><el-input required="" v-model="form.pass" autocomplete="on"></el-input><label>密码</label></div></el-form-item>
<el-form>.input-data{width: 100%;height: 40px;position: relative;
}:deep(.el-form){.el-form-item{margin-bottom: 62px;}.el-form-item__error{font-size: 14px;color: #F15151;line-height: 1.7;letter-spacing: 1px;}.el-input__inner{padding: 0;color: #FFFFFF;width: 100%;height: 40px;border: none;border-radius:0;border-bottom: 1px solid silver;font-size: 16px;background: transparent;}.is-required.is-error .el-input__inner{border:none !important;border-bottom:1px solid #FFFFFF !important;}.input-data{label{font-size: 16px;font-weight: normal;color: #FFFFFF;letter-spacing: 1px;position: absolute;bottom: 0;left: 0;pointer-events: none;transition: all 0.3s ease;}.el-input:has(> input:focus) ~ label,.el-input:has(> input:valid) ~ label{transform: translateY(-30px);font-size: 13px ;}}}