uniapp登录页面（ 适配：pc、小程序、h5）

<!-- 简洁登录页面 -->
<template>
	<view class="login-bg">
		<image class="img-a" src="https://zhoukaiwen.com/img/loginImg/2.png"></image>
		<image class="img-b" src="https://zhoukaiwen.com/img/loginImg/3.png"></image>
		<!-- 标题 -->
		<view class="t-b">{{ title }}</view>
		<view class="t-b2">欢迎登录</view>
		<view class="t-login">

			<form class="cl">
				<view class="t-a">
					<image src="https://zhoukaiwen.com/img/loginImg/user.png"></image>
					<input type="number" name="phone" placeholder="请输入账号" maxlength="11" v-model="phone" />
				</view>
				<view class="t-a">
					<image src="https://zhoukaiwen.com/img/loginImg/pwd.png"></image>
					<input type="password" name="code" maxlength="6" placeholder="请输入密码" v-model="pwd" />
				</view>
				<button @tap="login()">登 录</button>
				<view class="t-c">
					<text class="t-c-txt" @tap="reg()">注册账号</text>
					<text>返回首页</text>
				</view>
			</form>
			<view class="t-f">
				<span :style="{width:width+'px'}"></span>
				<text class="qt"> 其他登录方式 </text>
				<span :style="{width:width+'px'}"></span>
			</view>
			<view class="t-e cl">
				<view class="t-g" @tap="wxLogin()">
					<image src="https://zhoukaiwen.com/img/loginImg/wx2.png"></image>
				</view>
				<view class="t-g" @tap="zfbLogin()">
					<image src="https://zhoukaiwen.com/img/loginImg/qq2.png"></image>
				</view>
				<view class="t-g" @tap="zfbLogin()">
					<image src="https://zhoukaiwen.com/img/loginImg/wb.png"></image>
				</view>
			</view>
		</view>
		<image class="img-a" src="https://zhoukaiwen.com/img/loginImg/bg1.png"></image>
	</view>
</template>
<script>
	export default {
		data() {
			return {
				title: '数字政务！', //填写logo或者app名称，也可以用：欢迎回来，看您需求
				phone: '', //手机号码
				pwd: '', //密码
				width: ''
			};
		},
		onLoad() {
			setTimeout(() => {
				let query = uni.createSelectorQuery();
				query.select('.qt').boundingClientRect()
				query.select('.t-f').boundingClientRect()
				query.exec((res) => {
					console.log("res[0]", res[0]);
					console.log("res[1]", res[1])
					this.width = ((res[1].width - res[0].width) / 2) - 15
				})
			}, 200)
		},
		methods: {
			//当前登录按钮操作
			login() {
				var that = this;
				if (!that.phone) {
					uni.showToast({
						title: '请输入手机号',
						icon: 'none'
					});
					return;
				}
				if (!/^[1][3,4,5,7,8,9][0-9]{9}$/.test(that.phone)) {
					uni.showToast({
						title: '请输入正确手机号',
						icon: 'none'
					});
					return;
				}
				if (!that.pwd) {
					uni.showToast({
						title: '请输入密码',
						icon: 'none'
					});
					return;
				}
				uni.showToast({
					title: '登录成功！',
					icon: 'none'
				});
			},
			//立刻注册
			reg() {
				uni.showToast({
					title: '注册账号',
					icon: 'none'
				});
			}
		}
	};
</script>
<style scoped>
	.img-a {
		position: absolute;
		width: 100%;
		top: -150rpx;
		right: 0;
		z-index: -1;
	}

	.img-b {
		position: absolute;
		width: 50%;
		bottom: 0;
		left: -50rpx;
		z-index: -1;
	}

	.login-bg {
		max-width: 750px;
		width: 100vw;
		min-height: 100vh;
	}

	.t-b {
		text-indent: 40rpx;
		font-size: 46rpx;
		color: #000;
		padding: 200rpx 0 30rpx 0;
		font-weight: bold;
	}

	.t-b2 {
		text-indent: 40rpx;
		font-size: 32rpx;
		color: #aaaaaa;
		padding: 0rpx 0 60rpx 0;
	}

	.t-login {
		width: 80%;
		padding: 55rpx;
		margin: 0rpx auto 0 auto;
		font-size: 28rpx;
		z-index: 9;
	}

	.t-login button {
		font-size: 28rpx;
		background: linear-gradient(to right, #5677fc, hsla(217 100% 56% / 1));
		/* background-image: linear-gradient(325deg,
				hsla(217 100% 56% / 1) 0%,
				hsla(194 100% 69% / 1) 55%,
				hsla(217 100% 56% / 1) 90%); */
		color: #fff;
		height: 90rpx;
		line-height: 90rpx;
		border-radius: 50rpx;
	}

	.t-login input {
		padding: 0 20rpx 0 120rpx;
		height: 90rpx;
		line-height: 90rpx;
		margin-bottom: 50rpx;
		background: #f6f6f6;
		border: 1px solid #f6f6f6;
		font-size: 28rpx;
		border-radius: 50rpx;
	}

	.t-login .t-a {
		position: relative;
	}

	.t-login .t-a image {
		width: 40rpx;
		height: 40rpx;
		position: absolute;
		left: 40rpx;
		top: 28rpx;
	}

	.t-login .t-b {
		text-align: left;
		font-size: 46rpx;
		color: #000;
		padding: 300rpx 0 120rpx 0;
		font-weight: bold;
	}

	.t-login .t-d {
		text-align: center;
		color: #999;
		margin: 80rpx 0;
	}

	.t-login .t-c {
		display: flex;
		justify-content: space-evenly;
		color: #666666;
		margin: 30rpx 30rpx 40rpx 0;
	}

	.t-login .t-c .t-c-txt {
		margin-right: 300rpx;
	}

	.t-login .t-e {
		text-align: center;
		width: 80%;
		margin: 40rpx auto 0;
	}

	.t-login .t-g {
		float: left;
		width: 33.33%;
	}

	.t-login .t-e image {
		width: 70rpx;
		height: 70rpx;
	}

	.t-login .t-f {
		width: 100%;
		display: flex;
		align-items: center;
		justify-content: space-between;
		margin: 80rpx 0 0 0;
		color: #999;
		position: relative;
	}

	.t-login .t-f text {
		color: #b9b9b9;
		font-size: 27rpx;
	}

	.t-login .t-f span {
		display: block;
		background-color: #000;
		width: auto;
		height: 1.5rpx;
	}

	.t-login .uni-input-placeholder {
		color: #aeaeae;
	}

	.cl {
		zoom: 1;
	}

	.cl:after {
		clear: both;
		display: block;
		visibility: hidden;
		height: 0;
		content: '\20';
	}
</style>

参考文章：

复制了这个博主的大部分html结构和部分css（目前放置的是我初版的样式和代码后续根据业务调整了下，同时为了适配兼容修改成弹性布局及动态宽度）

uni-app 微信小程序之好看的ui登录页面（一）_微信小程序登录页面-CSDN博客 

uni-app 微信小程序之好看的ui登录页面（四）_微信小程序 登录页 样式-CSDN博客