<view class="body-view">
 <toast hidden="{{toast1Hidden}}" bindchange="toast1Change">
  默认
 </toast>
 <button type="default" bindtap="toast1Tap">点击弹出默认toast</button>
</view>
<view class="body-view">
 <toast hidden="{{toast2Hidden}}" duration="3000" bindchange="toast2Change">
  设置duration
 </toast>
 <button type="default" bindtap="toast2Tap">点击弹出设置duration的toast</button>
</view>

var toastNum = 2
var pageData = {}
pageData.data = {}
for (var i = 0; i <= toastNum; ++i) {
 pageData.data['toast'+i+'Hidden'] = true;
 (function (index) {
 pageData['toast'+index+'Change'] = function(e) {
  var obj = {}
  obj['toast'+index+'Hidden'] = true;
  this.setData(obj)
 }
 pageData['toast'+index+'Tap'] = function(e) {
  var obj = {}
  obj['toast'+index+'Hidden'] = false
  this.setData(obj)
 }
 })(i)
}
Page(pageData)