javascript - Why will this Js function return undefined? -


my goal pass in variable apply many processes within function, rule im unaware of must coming play. return passed variable, not return full object including variable parent...

var test = {number:1,color:'red'}; function make(data){     console.log(data)        //returns test     console.log(test.number) //returns 1     console.log(data,test.number) //returns test 1     console.log(data.number) //returns undefined }; make("test");

you calling string has no property number should call test object instead 

var test = {number:1,color:'red'};  function make(data){      console.log(data)        //returns test      console.log(test.number) //returns 1      console.log(data,test.number) //returns test 1      console.log(data.number) //returns 1  };  make(test);


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