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【Kevin Learn 小程序】-->跑马灯效果

效果图

【Kevin Learn 小程序】-->跑马灯效果_文字滚动

代码

1.app.js

//app.js
App({
onLaunch: function () {
console.log('App Launch')
},
onShow: function () {
console.log('App Show')
},
onHide: function () {
console.log('App Hide')
},
globalData: {
hasLogin: false
}
})
  1. app.json
{
"pages": [
"pages/marquee/marquee",
"pages/logs/logs"
],
"window": {
"backgroundTextStyle": "light",
"navigationBarBackgroundColor": "#fff",
"navigationBarTitleText": "WeChat",
"navigationBarTextStyle": "black"
},
"style": "v2",
"sitemapLocation": "sitemap.json"
}
  1. marquee.js
Page({
data: {
text: '这是一条会滚动的文字滚来滚去的文字跑马灯,哈哈哈哈哈哈哈哈',
marqueePace: 1,//滚动速度
marqueeDistance: 0,//初始滚动距离
marqueeDistance2: 0,
marquee2copy_status: false,
marquee2_margin: 60,
size: 14,
orientation: 'left',//滚动方向
interval: 20 // 时间间隔
},
onShow: function () {
// 页面显示
var vm = this;
var length = vm.data.text.length * vm.data.size;//文字长度
var windowWidth = wx.getSystemInfoSync().windowWidth;// 屏幕宽度
vm.setData({
length: length,
windowWidth: windowWidth,
marquee2_margin: length < windowWidth ? windowWidth - length : vm.data.marquee2_margin//当文字长度小于屏幕长度时,需要增加补白
});
vm.run1();// 水平一行字滚动完了再按照原来的方向滚动
vm.run2();// 第一个字消失后立即从右边出现
},
run1: function () {
var vm = this;
var interval = setInterval(function () {
if (-vm.data.marqueeDistance < vm.data.length) {
vm.setData({
marqueeDistance: vm.data.marqueeDistance - vm.data.marqueePace,
});
} else {
clearInterval(interval);
vm.setData({
marqueeDistance: vm.data.windowWidth
});
vm.run1();
}
}, vm.data.interval);
},
run2: function () {
var vm = this;
var interval = setInterval(function () {
if (-vm.data.marqueeDistance2 < vm.data.length) {
// 如果文字滚动到出现marquee2_margin=30px的白边,就接着显示
vm.setData({
marqueeDistance2: vm.data.marqueeDistance2 - vm.data.marqueePace,
marquee2copy_status: vm.data.length + vm.data.marqueeDistance2 <= vm.data.windowWidth + vm.data.marquee2_margin,
});
} else {
if (-vm.data.marqueeDistance2 >= vm.data.marquee2_margin) { // 当第二条文字滚动到最左边时
vm.setData({
marqueeDistance2: vm.data.marquee2_margin // 直接重新滚动
});
clearInterval(interval);
vm.run2();
} else {
clearInterval(interval);
vm.setData({
marqueeDistance2: -vm.data.windowWidth
});
vm.run2();
}
}
}, vm.data.interval);
}
})
  1. marquee.json
{
"navigationBarTitleText": "跑马灯效果"
}
  1. marquee.wxml
<!--pages/marquee/marquee.wxml-->
<view class="title">1 显示完后再显示</view>
<view class="example">
<view class="marquee_box">
<view class="marquee_text" style="{{orientation}}:{{marqueeDistance}}px;font-size: {{size}}px;">
{{text}}
</view>
</view>
</view>
<view class="title">2 出现白边后即显示</view>
<view class="example">
<view class="marquee_box">
<view class="marquee_text" style="{{orientation}}:{{marqueeDistance2}}px;font-size: {{size}}px;">
<text>{{text}}</text>
<text wx:if="{{marquee2copy_status}}" style="margin-left:{{marquee2_margin}}px;">{{text}}</text>
</view>
</view>
</view>
<view class="marquee_panel">
<view>
<view>配置参数说明</view>
<view>size:文字大小</view>
<view>marqueePace:滚动速度</view>
<view>interval:滚动时间间隔</view>
<view>orientation:滚动方向</view>
<view>marquee2_margin:2的白边长度</view>
</view>
</view>
  1. marquee.wxss
Page {
background: #fff;
overflow: hidden;
line-height: 60rpx;
}

.example {
display: block;
width: 100%;
height: 100rpx;
}

.marquee_box {
width: 100%;
position: relative;
}

.marquee_text {
white-space: nowrap;
position: absolute;
top: 0;
}

.title {
padding: 10rpx 20rpx;
margin: 0 0 20rpx 0;
border-left: 10rpx solid #ccc;
font-size: 30rpx;
background: #ececec;
}

.marquee_panel {
margin: 20rpx 20rpx 20rpx 0;
border-left: 10rpx solid #ccc;
font-size: 26rpx;
}

.marquee_panel>view {
padding: 30rpx;
background: #ececec;
border-radius: 0 20rpx 20rpx 0;
}


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