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最近看到好多app上有波浪背景，有动态的，有静态的，这里是在小程序中用得动态。
先看看效果图：里面的文本是组件内部定义的。
这是用两个svg的图片用css关键帧动画做的效果（这里谢谢子弹短信里前端群的小伙伴提供的web版的css动画文件）
在小程序中使用，注意一个问题：就是svg不可以直接使用，需要转为base64（这个大家应该有收藏吧），这里我已经转换好了，在下面的wxss中。
这里顺便用一下自定义组件：
首先定义组件 wave
wave.wxml：这里我默认是用得显示个人信息。其中isShowInfo来控制是否显示
<!--utils/wave/waves.wxml--> <view class="zr"> <view class='user_box' hidden="{
{isShowInfo}}"> <view class='userInfo'> <open-data
type="userAvatarUrl"></open-data> </view> <view class='userInfo_name'>
<open-data type="userNickName"></open-data>,欢迎您 </view> </view> <view
class="water"> <view class="water-c"> <view class="water-1"> </view> <view
class="water-2"> </view> </view> </view> </view>
wave.js：这里组件定义一个私有方法 __hideInfo(),用来隐藏内部组件，灵活运用很方便。
// utils/wave/waves.js Component({ /** * 组件的属性列表 */ properties: { }, /** *
组件的初始数据 */ data: { isShowInfo:false }, /** * 组件的方法列表 */ methods: {
__hideInfo:function(){ this.setData({ isShowInfo:true }) } }, })
wave.json：第一个是设置为自定义组件，第二个可选是使用其他的自定义组件，比如引用组件，一会就会用得
{ "component": true, "usingComponents": {} }
wave.wxss：zr的背景直接改为自己需要的，或者用属性传递。
/*组件背景颜色*/ .zr { background: #0396FF; width: 100%; height:100px; position:
relative; } .water { position: absolute; left: 0; bottom: -10px; height: 30px;
width: 100%; z-index: 1 } .water-c { position: relative } .water-1 {
background:
url("data:image/svg+xml;base64,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")
repeat-x; background-size: 600px; -webkit-animation: wave-animation-1 3.5s
infinite linear; animation: wave-animation-1 3.5s infinite linear } .water-2 {
top: 5px; background:
url("data:image/svg+xml;base64,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")
repeat-x; background-size: 600px; -webkit-animation: wave-animation-2 6s
infinite linear; animation: wave-animation-2 6s infinite linear } .water-1,
.water-2 { position: absolute; width: 100%; height: 60px } .back-white {
background: #fff } @keyframes wave-animation-1 { 0% { background-position: 0
top } 100% { background-position: 600px top } } @keyframes wave-animation-2 {
0% { background-position: 0 top } 100% { background-position: 600px top } }
.user_box { display: flex; z-index: 10000!important; } .userInfo_name { flex:
1; vertical-align: middle; width: 100%; margin-left: 5%; margin-top: 5%; }
.userInfo { flex: 1; width: 100%; border-radius: 50%; overflow: hidden;
max-height: 50px; max-width: 50px; margin-left: 5%; margin-top: 5%; border: 2px
solid #fff; }
组件定义完，下面是引用这个组件：
index.json:这里用到了userxxx使用我们定义的组件，引用名为wave，这也是一会使用的节点名，和view一样直接用
{ //使用组件，引用名（直接当做节点使用）,路径 "usingComponents": { "wave": "../com/wave/waves" } }
index.wxml
index.js:通过wave设置的id获取组件对象，调用私有方法。去除内部信息。
onLoad: function (options) { this.wave = this.selectComponent("#wave");
this.wave.__hideInfo() },
再来一个静态图：
好了。