如何通过变量值动态访问对象属性

Question

I'm using AJAX to send data to a controller and retrieve it. When I have console.log(result.ans2.pass) it works.

However with console.log(result.ans + x + .pass) It keeps given me an error:

expected expression, got '.'

 $.ajax({ type: "POST", url: 'http://some-url', dataType: "json", data: { datasent: dataKey }, cache: false, success: function(result) { var x = 2; console.log(result.ans + x + .pass) } }); 

Answer 1

要使用字符串访问对象的属性，您需要使用方括号表示法：

console.log(result['ans' + x].pass)

Answer 2

You can't dynamically add to a variable name like you're trying to do with dot notation . Instead, you can use bracket notation and concatenation so that you can access your property name using a string:

console.log(result["ans"+x].pass)