如何使用变量或函数名称作为JavaScript中对象属性的占位符？

Question

Is there any easy way in JavaScript to use a variable or a function name as a property of a object like this:

 var someObject = { piece1: 'one', piece2: 'two' }; var trial = "piece1"; alert(someObject[trial]); function someFunction(secondTrial) { return someObject[secondTrail]; }; alert(someFunction(piece1)); 

so that "trial" & "secondTrial" will work as well as "someObjects"'s property; so essentially they would both work like "someObject.piece1"?

Answer 1

When you do someFunction(piece1) , piece1 will be treated as a variable and since it is not defined yet, ReferenceError: piece1 is not defined will be thrown. You need to pass that as a string, like this

alert(someFunction("piece1"));