uniapp 按钮动态监听

<template>
	<view class="main-container">
		<view class="list">
			<view class="item" :id="index">
				<view class="text">
					输入密码
				</view>
				<view class="arrow">
					<input value="" type="password" v-model="password1" placeholder="请输入新密码(6-20位数字)" class="input-class" placeholder-class="pcl"/>
				</view>
			</view>
			<view class="item" :id="index">
				<view class="text">
					确认密码
				</view>
				<view class="arrow">
					<input value="" type="password" v-model="password2" placeholder="请再次输入密码" class="input-class" placeholder-class="pcl"/>
				</view>
			</view>
		</view>

		<view class="save-pwd" :class="!disabled ? 'active': ''" @tap="clickSave" :disabled="disabled">
			保存{{disabled}}
		</view>
	</view>
</template>

<script>
	const app = getApp()
	export default {
		data() {
			return {
				password1: '',
				password2: '',
				disabled:true,
			}
		},
		//监听按钮的颜色
		watch:{
			password1(val){
				this.OnBtnChange();
			},
			password2(val){
				this.OnBtnChange();
			},
		},

		methods:{
			// 改变按钮状态
			OnBtnChange(){
				if( this.password1 && this.password2 ){
					this.disabled=false;
					console.log('this.disabled',this.disabled)
					return;
				}
				this.disabled=true;
			},

			clickSave() {
				if(this.password1.trim().length < 6) {
					uni.showToast({
						title:'密码不足6位',
						icon:'none'
					})
				} else if(this.password1.trim().length > 20) {
					uni.showToast({
						title:'密码超过20位',
						icon:'none'
					})
				}
				if(!this.password1 || !this.password2 || this.password1.trim() !== this.password2.trim()) {
					uni.showToast({
						title:'两次密码不一致',
						icon:'none'
					})
					return false;
				}

				this.$http.post('updatepwd', {
					userId: app.globalData.userId,
					password: this.password1
				},{token: 'token'}).then(([error, res])=>{
					if(res.data.code == 1) {
						uni.showToast({
							title:'密码更新成功',
							icon:'none',
						})

						setTimeout(() => {
							uni.navigateBack({
								delta:1
							})
						},1000)
					}

				})
			}
		}
	}
</script>

<style>
	.main-container {
		 100vw;
		height: 100vh;
		box-sizing: border-box;
		background: #FFFFFF;
		opacity: 1;
		padding-top: 30rpx;
		border-top: 30rpx solid #FBFAF9;
	}
	.list {
		 100%;
		display: flex;
		flex-direction: column;
		justify-content: flex-start;
		background-color: #FFFFFF;
	}
	.item {
		 670rpx;
		height: 140rpx;
		margin: 0 auto;
		display: flex;
		justify-content: space-between;
		align-items: center;
	}
	.item:last-child {
		border: 0;
	}
	.item .text {
		height: 140rpx;
		line-height: 140rpx;
		font-size: 32rpx;
		font-family: PingFang SC;
		font-weight: 700;
		color: #000000;
		opacity: 0.8;

	}
	.item .arrow {
		height: 100%;
		flex: 1 0 516rpx;
		border-bottom: 2rpx solid rgba(0,0,0,0.1);
		display: flex;
		justify-content: flex-start;
		align-items: center;
	}
	.pcl {
		font-size: 32rpx;
		font-family: PingFang SC;
		font-weight: 500;
		color: #000000;
		opacity: 0.4;
		text-indent: 20rpx;
	}
	.input-class {
		 450rpx;
		padding-left: 15rpx;
		font-size: 32rpx;
	}
	.save-pwd {
		 304rpx;
		height: 88rpx;
		background: #FFFFFF;
		border: 2rpx solid #989898;
		opacity: 1;
		border-radius: 46px;
		font-size: 32rpx;
		font-family: PingFang SC;
		font-weight: bold;
		color: #999999;
		opacity: 1;
		margin: 100rpx auto 0;
		display: flex;
		justify-content: center;
		align-items: center;
	}
	.active{
		background: #4DB046;
		color: #ffffff;
		border: 0;
	}
</style>