JavaScript 拼接问题
A 有一个对象数组，我想从中删除第一个元素并读取它的一些属性。但我不能。这是代码：
$.test = function(){
var array = [
{a: "a1", b: "b1"},
{a: "a2", b: "b2"},
{a: "a3", b: "b3"}
];
alert("0. element's 'a': " + array[0].a);
alert("length: " + array.length);
var element = array.splice(0, 1);
alert("length: " + array.length);
alert("removed element's 'a': " + element.a);
}
我得到：
3
a1
2
undefined
为什么我总是得到“未定义”？ splice 方法应该删除定义的元素并返回它/它们。
A have an array of Objects and I'd like to remove the first element from it and read some of its properties. But I can't. Here is the code:
$.test = function(){
var array = [
{a: "a1", b: "b1"},
{a: "a2", b: "b2"},
{a: "a3", b: "b3"}
];
alert("0. element's 'a': " + array[0].a);
alert("length: " + array.length);
var element = array.splice(0, 1);
alert("length: " + array.length);
alert("removed element's 'a': " + element.a);
}
I get:
3
a1
2
undefined
Why do I always get "undefined"? The splice method is supposed to remove the defined element(s) and return it / them.
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评论（2）
您可以使用
shift来完成此操作 - 它删除并返回数组中的第一个元素。您的问题是 splice 返回一个数组，因此您的代码必须是：
You can use
shiftto accomplish this - it removes and returns the first element in an array.Your problem is that splice returns an array so your code would have to be:
splice返回已删除元素的数组。这应该有效
splicereturns a array of the removed elements.this should work