在web中，我們動態新增DOM，可以用jQuery的方法，很簡單。在微信小程式中怎麼實現下面這麼需求。

其中，里程數代表上一行到這一行地方的距離（這個不重要）；要實現的就是點選增加途徑地，就多一行，刪除途徑地，就少一行。

分析：新增的和刪除的是同樣的結構，只是數量不一樣，所以考慮迴圈，用列表表示，增加就往這個列表push一個，刪除就從列表pop一個。

主要程式碼如下：

<view class="weui-cell weui-cell_input">
	<view class="weui-cell__hd">
		<view class
 
="weui-label rui-justify">
			<text space="ensp">出 發 地</text>
		</view>
	</view>
	<view class="weui-cell__bd">
		<input class="weui-input" name="beginAddress" bindinput="inputedit" data-obj="info" data-item="beginAddress" value="{{info.beginAddress}}"
		 placeholder=
 
"請輸入出發地" disabled="{{info.isPreDetail}}" />
	</view>
</view>

<view wx:for="{{info.details}}" wx:key="key" class="forItemBorder">
	<view class="weui-cell weui-cell_input ">
		<view class="weui-cell__hd">
			<view class="weui-label rui-justify">
				<text space=
 
"ensp">途 徑 地</text>
			</view>
		</view>
		<input class="weui-input" id="place-{{index}}" bindinput="setPlace" placeholder="請輸入途徑地" />
		<input class="weui-input lcs" id="number-{{index}}" bindinput="setNumber" placeholder="里程數(km)" />
	</view>
</view>

<view class="weui-cell weui-cell_input">
	<view class="weui-cell__hd">
		<view class="weui-label rui-justify">
			<text space="ensp">目 的 地</text>
		</view>
	</view>
	<input class="weui-input" name="destination" bindinput="inputedit" data-obj="info" data-item="destination" value="{{info.destination}}"
	 placeholder="請輸入目的地" disabled="{{info.isPreDetail}}" />
	<input class="weui-input lcs" name="endLength" bindinput="inputedit" data-obj="info" data-item="endLength" value="{{info.endLength}}"
	 placeholder="里程數(km)" disabled="{{info.isPreDetail}}" />
</view>

<view class="weui-cell" hidden="{{info.isPreDetail}}">
	<button type='primary' bindtap='addItem' style='width:50%;'>增加途徑地</button>
	<button type='primary' bindtap='removeItem' style='width:50%;margin-left:5rpx;'>
		刪除途徑地
	</button>
</view>

因為新增刪除的是相同的結構，所以我構造了一個類Detail來表示這個view

/**
 * Detail類 建構函式 
 * @param {string} placeName 途徑地
 * @param {string} number 里程數
 */
function Detail(placeName, number) {
  this.placeName = placeName;
  this.number = number;
}
function Info() {
  this.details = [];
}

Page({
  data: {
    info: {}
  },
  init: function () {
    let that = this;
    this.setData({
      info: new Info(),
    });
  },
  onLoad: function (options) {
    this.init();
  },
  addItem: function (e) {
    let info = this.data.info;
    info.details.push(new Detail());
    this.setData({
      info: info
    });
  },
  removeItem: function (e) {
    let info = this.data.info;
    info.details.pop();
    this.setData({
      info: info
    });
  },

})

這時候，能對view動態增刪了，那麼對資料怎麼處理，給每個生成的view新增id屬性，通過id屬性來判斷操作的是哪個Detail類。js部分程式碼如下：

setPlace: function (e) {
    let index = parseInt(e.currentTarget.id.replace("place-", ""));
    let place = e.detail.value;
    let info = this.data.info;
    info.details[index].placeName = place;
    this.setData({
      info: info
    });
  },

setNumber: function (e) {
    let index = parseInt(e.currentTarget.id.replace("number-", ""));
    let number = e.detail.value;
    let info = this.data.info;
    info.details[index].number = number;
    this.setData({
      info: info
    });
  },