Comparison and use mpVue framework Wepy frame and frame mpVue point to note

Wepy framework
it is a framework class Vue, Vue draws on code style, and Vue itself has nothing to do.

mpVue frame
which is a frame from the core through the secondary development of code for the entire Vue formed, it is equivalent to forming Vue itself, increase the ability to develop small micro-channel program.

The difference between the three Figure:

Need some attention when using mpVue:

1. In the template, the dynamic insertion of v-html HTML instructions not available

This is well understood, the interface is not based applet BOM / DOM browser, so can not dynamically insert HTML snippets directly in the interface template to display.

The way, if there is a small fragment insert html procedures in demand how to do? Can use Components or wxParse ( https://github.com/icindy/wxParse) is achieved .

These limitations include bis bracket expression syntax {} {} function is 2. In the template, for data binding

Vue itself within the template double-bracket syntax, we can compare the process to enrich bind variables, such as:

• You can call a function in methods, such as:

<template>
  <div>{{ formatMessage(msg) }}</div>
</template>

<script>
export default {
  data() {
    return {
      msg: "Hello,World"
    }
  },
  methods: {
    formatMessage(str) {
      return str.trim().split(',').join('#')
    }
  }
}
</script>

• If the variable is an object, you can also call the object's member method
  <div>{{ msg.trim().split(',').join('#') }}</div>
• Filters can be used to process variables, the most useful of the scene data be formatted
  <div>{{ msg | format }}</div>

These useful features, in mpvue in, all I remember is not used Oh! ! !

We can only use double brackets in some simple arithmetic operators (+ - *%:? == ===> <[]!.).

Consider using computed attribute (computed) do.

3. In the template, in addition to the event listener, the other place can not function under the methods call

Available alternatives: Calculated Properties

4. in the template does not support a direct binding to the target class or style attributes

The best solution: Calculated Properties

<template>
  <div :class="classStr"></div>
</template>

<script>
export default {
  data() {
    return {
      classObject: {
        active: true,
        'text-danger': false
      }
    }
  },
  computed: {
    classStr() {
      let arr = []
      for (let p in this.classObject) {
        if (this.classObject[p]) {
          arr.push(p)
        }
      }
      return arr.join(' ') 
    }
  }
}
</script>

5. In the template, nested v-for, index must be specified index

Usually, we nested loop when rendered in Vue array of templates, usually looks like this:

<template>
  <ul v-for="category in categories">
    <li v-for="product in category.products">{{product.name}}</li>
  </ul>
</template>

但在mpvue中使用这种嵌套结构的v-for时，则必须每层的v-for上都给出索引，且索引需取不同名字：

<template>
  <ul v-for="(category, index) in categories">
    <li v-for="(product, productIndex) in category.products">{{product.name}}</li>
  </ul>
</template>

6. 事件处理中的注意点

在mpvue中，一般可以使用Web的DOM事件名来绑定事件，mpvue会将Web事件名映射成对应的小程序事件名，对应列表如下：

// 左侧为WEB事件 : 右侧为对应的小程序事件
{
click: 'tap',
touchstart: 'touchstart',
touchmove: 'touchmove',
touchcancel: 'touchcancel',
touchend: 'touchend',
tap: 'tap',
longtap: 'longtap',
input: 'input',
change: 'change',
submit: 'submit',
blur: 'blur',
focus: 'focus',
reset: 'reset',
confirm: 'confirm',
columnchange: 'columnchange',
linechange: 'linechange',
error: 'error',
scrolltoupper: 'scrolltoupper',
scrolltolower: 'scrolltolower',
scroll: 'scroll'
}

除了上面的之外，Web表单组件<input>和<textarea>的change事件会被转为blur事件。

然后，像keydown、keypress之类的键盘事件也没有了，因为小程序没有键盘，所以不需要这些事件。

7. 对于表单，请直接使用小程序原生的表单组件

其他注意事项

另外，在Vue开发Web应用的时候，通常使用vue-router来进行页面路由。但是在mpvue小程序开发中，不能用这种方式，请使用标签和小程序原生API wx.navigateTo等来做路由功能。

还有就是请求后端数据，我们通常在Web开发中使用axios等ajax库来实现，但是在小程序开发中也是不能用的，也请使用小程序的原生API wx.request等来进行。

微信小程序的UI组件库

• WeUI
• iView
• ZanUI
• MinUI
• Wux
• ColorUI