Javascript 替换对象数组中的元素
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Replacing an element in an object array
提问by RolandG
I want to replace the entire object in an array.
我想替换数组中的整个对象。
var array = [ {name: "name1" }, { name: "name2" } ];
var element = array[0];
element = {name: "name3"};
alert(array[0].name);
In this piece of code I would expect the output name3, why can't I replace an entire object in an array like this? And what is the good way to do this?
在这段代码中，我希望输出 name3，为什么我不能像这样替换数组中的整个对象？这样做的好方法是什么？
回答by Jon
The correct way is
正确的方法是
array[0] = {name: "name3"};
Your existing code does not work as expected because you are taking a referenc* to the first element with
您现有的代码无法按预期工作，因为您将引用 * 引用到第一个元素
var element = array[0];
and then you are replacing the value of this local variablewith another object. This leaves the original array unmodified.
然后你用另一个对象替换这个局部变量的值。这使原始数组保持不变。
回答by Manse
Try this :
尝试这个 ：
var array = [ {name: "name1" }, { name: "name2" } ];
array[0] = {name: "name3"};
alert(array[0].name);
elementis not the actual array - its a copy of the array
element不是实际的数组 - 它是数组的副本
