javascript - 为什么我的 JS 对象最终有 "undefined"值？

Question

var testRuleInput = {
    "ruleName" : "renderDataVerificationFields",
    "dependencies" : [
        {
            "fieldName" : "mailingStreetAddress",
            "resource" : "verificationResults",
            "attribute" : "verifyStreetAddress"
        }
    ]
};

但是，当我稍后调用 console.log(testRuleInput.dependencies.attribute) 时；我得到 undefined。糊涂了!

Answer 1

dependencies 是一个对象数组。

更新您的代码:

console.log(testRuleInput.dependencies[0].attribute)

或者删除数组语法:

"dependencies": {
    "fieldName": "mailingStreetAddress",
    "resource": "verificationResults",
    "attribute": "verifyStreetAddress"
}