如何在JavaScript中获取特定数组索引的值?

I have an array and simply wants to get the element / value at index 1

我有一个数组，只想在索引1处获得元素/值

var myValues = new Array();
var valueAtIndex1 = myValues.getValue(1); // (something like this)

How can I get the value at the 1st index of my array in JavaScript?

如何在JavaScript中获取数组的第一个索引值?

4 个解决方案

#1

102

Just use indexer

只使用索引器

var valueAtIndex1 = myValues[1];

#2

Array indexes in JavaScript start at zero for the first item, so try this:

对于第一个条目，JavaScript中的数组索引从0开始，请尝试以下操作:

var firstArrayItem = myValues[0]

Of course, if you actually want the second item in the array at index 1, then it's myValues[1].

当然，如果你想要数组中的第二项在索引1处，那么它就是myValues[1]。

See Accessing array elements for more info.

有关更多信息，请参见访问数组元素。

#3

You can just use []:

你可以用[]:

var valueAtIndex1 = myValues[1];

#4

-3

I know this is kind of late but here's another way :)

我知道这有点晚了，但还有另一种方法:

// var psn_ = myForm.elements['array_name[]'];     // --> getting array by name

var myValues = new Array();

if( myValues.length == undefined ) {       // if length is 1, length becomes undefined
    myValues = [].concat(myValues);        // make 'myValues' an array
    var tempVar = myValues[0].value;       // get and store value
}
else{
    var tempVar = "";                               // temporary variable to store all values of array
    for (var i = 0; i < myValues.length; i++) {
        tempVar += myValues[i].value;               // example ["one", "two"]
        tempVar += ',';                             // tempVar = one,two,
    }
    tempVar = tempVar.substring(',', tempVar.length - 1);    // tempVar = one,two
}

Passing to another file

传递到另一个文件

... "url_name.php?tempVar=" + tempVar + ...   // passing through URL

Get the values in PHP through

通过PHP获取值

$getValue = $_GET['tempVar'];                // get value from tempVar in URL
$getValue_Array = explode(',', $getValue);   // getValue_Array[0] = "one" 
                                             // getValue_Array[1] = "two"

#1

102