Question

我想知道使用this.setState({property: 1}) and this.state.property = 1`

之间有什么区别，如果有的话

var App = React.createClass({

   getInitialState: function(){
      return({number: 0})
   },

   increaseNumber: function(){
      this.state.number += 1;
   },

   decreaseNumber: function(){
      this.setState({number: this.state.number - 1})
   }
})

Answer 1

如果你这样做：

SELECT . . .
FROM Item i INNER JOIN
     ItemClassComponent icc
     ON icc.ItemID = i.ID INNER JOIN
     ItemClass ic
     ON ic.ID = icc.ItemClassID INNER JOIN
     (SELECT _icc.ItemClassID, MAX(_i.LastUpdated) AS LastUpdated
      FROM Item _i JOIN
           ItemClassComponent _icc
           ON _icc.ItemID = _i.ID
      GROUP BY _icc.ItemClassID
     ) lu
    ON lu.LastUpdated = i.LastUpdated AND lu.ItemClassId = ic.Id;

它是一个直接实现，但是如果你使用setter执行它，你可以处理异常或类似的东西，因为你将初始化值。在这种情况下，它并不重要。

我希望我能帮助你。：）

setState和this.state之间的区别

1 个答案: