javascript - 如何从数组中检索和访问 javascript 对象文本中的字段？

Question

这是一个简短的 JS 函数，它尝试从数组中检索对象并访问其唯一字段:

function foo()
{
    var fruitLiteral = {name : "Orange"};
    var myArray = [];
    myArray.push(fruitLiteral);
    console.log(" myArray after push " + myArray);
    var rc = myArray.splice(0,1);
    console.log(" myArray after splice " + myArray);
    console.log(rc.name);
}

输出:

 myArray after push [object Object]
 myArray after splice 
 undefined   //wanted to see rc.name, or "Orange" here.

数组似乎在拼接后已按预期清空，但当从拼接检索到的项目是文字对象时，我总是得到“未定义”。我的错误在哪里？

Answer 1

问题在于，您的 fruitLiteral 在拼接后仍然存储为 rc 数组的第一个元素，因此您需要像这样对待它。

function foo()
{
    var fruitLiteral = {name : "Orange"};
    var myArray = [];
    myArray.push(fruitLiteral);
    console.log(" myArray after push " + myArray);
    var rc = myArray.splice(0,1);
    console.log(" myArray after splice " + myArray);
    console.log(rc[0].name);
}