功能未定义（即使它是）

Question

我在.then promise

中调用此函数

this.retrieveMatches();

此功能如下所示

retrieveMatches: function(){
    var tableResult = makeHTMLMatchesTable(fetchMatches());
    var matches = document.getElementById('matches')
    matches.parentNode.insertBefore(tableResult, matches);
  },

这个功能正好在它上面：

 makeHTMLMatchesTable: function(array){
    //does stuff
    }

那么为什么控制台这样说：

Uncaught (in promise) ReferenceError: makeHTMLMatchesTable is not defined

什么时候明确定义了？

Answer 1

更改此代码

retrieveMatches: function(){
    var tableResult = makeHTMLMatchesTable(fetchMatches());
    var matches = document.getElementById('matches')
    matches.parentNode.insertBefore(tableResult, matches);
  },

到

retrieveMatches: function(){
    var tableResult = this.makeHTMLMatchesTable(fetchMatches());
    var matches = document.getElementById('matches')
    matches.parentNode.insertBefore(tableResult, matches);
  }.bind(this),