[improvement] rename packages dir to src (#3659)

src/lazyload/demo/index.vue

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+<template>
+  <demo-section>
+    <demo-block :title="$t('basicUsage')">
+      <img
+        v-for="img in imageList"
+        v-lazy="img"
+      >
+    </demo-block>
+
+    <demo-block :title="$t('title2')">
+      <div
+        v-for="img in backgroundImageList"
+        v-lazy:background-image="img"
+      />
+    </demo-block>
+
+    <demo-block :title="$t('title3')">
+      <lazy-component>
+        <img
+          v-for="img in componentImageList"
+          v-lazy="img"
+        >
+      </lazy-component>
+    </demo-block>
+  </demo-section>
+</template>
+
+<script>
+export default {
+  i18n: {
+    'zh-CN': {
+      title2: '背景图懒加载',
+      title3: '懒加载模块'
+    },
+    'en-US': {
+      title2: 'Lazyload Background Image',
+      title3: 'Lazyload Component'
+    }
+  },
+
+  data() {
+    return {
+      imageList: [
+        'https://img.yzcdn.cn/public_files/2017/09/05/3bd347e44233a868c99cf0fe560232be.jpg',
+        'https://img.yzcdn.cn/public_files/2017/09/05/c0dab461920687911536621b345a0bc9.jpg',
+        'https://img.yzcdn.cn/public_files/2017/09/05/4e3ea0898b1c2c416eec8c11c5360833.jpg',
+        'https://img.yzcdn.cn/public_files/2017/09/05/fd08f07665ed67d50e11b32a21ce0682.jpg'
+      ],
+      backgroundImageList: [
+        'https://img.yzcdn.cn/public_files/2017/09/05/bac1903e863834ace25773f3554b6890.jpg',
+        'https://img.yzcdn.cn/public_files/2017/09/05/138c32d4384b5e4a78dc4e1ba58e6a80.jpg'
+      ],
+      componentImageList: [
+        'https://img.yzcdn.cn/public_files/2017/09/05/100a7845756a70af2df513bdd1307d0e.jpg',
+        'https://img.yzcdn.cn/public_files/2017/09/05/8a4f5be8289cb3a7434fc19a3de780a2.jpg'
+      ]
+    };
+  }
+};
+</script>
+
+<style lang="less">
+.demo-lazyload {
+  padding: 15px;
+
+  img,
+  div[lazy] {
+    box-sizing: border-box;
+    width: 100%;
+    height: 250px;
+    margin: 10px 0 0;
+    padding: 15px;
+    background-color: white;
+    background-repeat: no-repeat;
+    background-position: 15px;
+    background-size: 315px 250px;
+    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
+  }
+
+  .van-doc-demo-block__title,
+  .van-doc-demo-section__title {
+    padding-left: 0;
+  }
+}
+</style>

src/lazyload/en-US.md

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+# Lazyload
+
+### Install
+
+```js
+import Vue from 'vue';
+import { Lazyload } from 'vant';
+
+Vue.use(Lazyload, options);
+```
+
+## Usage
+
+### Basic Usage
+
+```html
+<img v-for="img in imageList" v-lazy="img" >
+```
+
+```javascript
+export default {
+  data() {
+    return {
+      imageList: [
+        'https://img.yzcdn.cn/1.jpg',
+        'https://img.yzcdn.cn/2.jpg'
+      ]
+    };
+  }
+}
+```
+
+### Lazyload Background Image
+
+Use `v-lazy:background-image` to set background url, and declare the height of the container.
+
+```html
+<div v-for="img in imageList" v-lazy:background-image="img" />
+```
+
+### Lazyload Component
+
+```html
+<lazy-component>
+  <img v-for="img in imageList" v-lazy="img" >
+</lazy-component>
+```
+
+## API
+
+### Options
+
+| Attribute | Description | Type | Default |
+|------|------|------|------|
+| loading | Src of the image while loading | `String` | - |
+| error | Src of the image upon load fail | `String` | - |
+| preload | Proportion of pre-loading height | `String` | - |
+| attempt | Attempts count | `Number` | `3` |
+| listenEvents | Events that you want vue listen for | `Array` | `scroll`... |
+| adapter | Dynamically modify the attribute of element | `Object` | - |
+| filter | The image's listener filter | `Object` | - |
+| lazyComponent | Lazyload component | `Boolean` | `false` |
+
+See more：[ vue-lazyload ](https://github.com/hilongjw/vue-lazyload)

src/lazyload/index.js

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+import Lazyload from 'vue-lazyload';
+
+export default Lazyload;

src/lazyload/zh-CN.md

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+# Lazyload 图片懒加载
+
+### 引入
+
+`Lazyload` 是 `Vue` 指令，使用前需要对指令进行注册
+
+```js
+import Vue from 'vue';
+import { Lazyload } from 'vant';
+
+// options 为可选参数，无则不传
+Vue.use(Lazyload, options);
+```
+
+## 代码演示
+
+### 基础用法
+
+将`v-lazy`指令的值设置为你需要懒加载的图片
+
+```html
+<img v-for="img in imageList" v-lazy="img" >
+```
+
+```javascript
+export default {
+  data() {
+    return {
+      imageList: [
+        'https://img.yzcdn.cn/1.jpg',
+        'https://img.yzcdn.cn/2.jpg'
+      ]
+    };
+  }
+}
+```
+
+### 背景图懒加载
+
+和图片懒加载不同，背景图懒加载需要使用`v-lazy:background-image`，值设置为背景图片的地址，需要注意的是必须声明容器高度。
+
+```html
+<div v-for="img in imageList" v-lazy:background-image="img" />
+```
+
+### 懒加载模块
+
+懒加载模块需要使用到`lazy-component`，将需要懒加载的内容放在`lazy-component`中即可。
+
+```html
+<lazy-component>
+  <img v-for="img in imageList" v-lazy="img" >
+</lazy-component>
+```
+
+## API
+
+### Options
+
+| 参数 | 说明 | 类型 | 默认值 | 版本 |
+|------|------|------|------|------|
+| loading | 加载时的图片 | `String` | - | - |
+| error | 错误时的图片 | `String` | - | - |
+| preload | 预加载高度的比例 | `String` | - | - |
+| attempt | 尝试次数 | `Number` | `3` | - |
+| listenEvents | 监听的事件 | `Array` | `scroll`等 | - |
+| adapter | 适配器 | `Object` | - | - |
+| filter | 图片 URL 过滤 | `Object` | - | - |
+| lazyComponent | 是否能懒加载模块 | `Boolean` | `false` | - |
+
+更多内容请参照：[vue-lazyload 官方文档](https://github.com/hilongjw/vue-lazyload)