在jQuery.each（）之后，数组中的字符串不再是字符串

I'm pretty confused with the behaviour of arrays of strings when I loop them through the jQuery.each() method. Apparently, the strings become jQuery objects inside the callback function. However, I cannot use the this.get() method to obtain the original string; doing so triggers a this.get is not a function error message. I suppose the reason is that it's not a DOM node. I can do $(this).get() but it makes my string become an array (from "foo" to ["f", "o", "o"]).

当我通过jQuery.each()方法循环它时,我对字符串数组的行为很困惑。显然,字符串成为回调函数中的jQuery对象。但是,我不能使用this.get()方法来获取原始字符串;这样做会触发this.get不是函数错误消息。我想原因是它不是DOM节点。我可以做$(this).get()但它使我的字符串成为一个数组(从“foo”到[“f”,“o”,“o”])。

How can I cast it back to string? I need to get a variable of String type because I pass it to other functions that compare the values among them.

我怎么能把它扔回字符串?我需要获取String类型的变量,因为我将它传递给其他函数来比较它们之间的值。

I enclose a self-contained test case (requires Firebug's console):

我附上一个独立的测试用例(需要Firebug的控制台):

<!DOCTYPE html>
<html>
<head><title></title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript"><!--
$(function(){
    var foo = [];
    var $foo = $(foo);

    foo.push("987");
    $foo.push("987");

    foo.push("654");
    $foo.push("654");

    $.each(foo, function(i){
        console.log("foo[%d]: object=%o; value=%s; string=%o", i, this, this, $(this).get()); // this.get() does not exist
    });
    $foo.each(function(i){
        console.log("$foo[%d]: object=%o; value=%s; string=%o", i, this, this, $(this).get()); // this.get() does not exist
    });
});
//--></script>
</head>
<body>

</body>
</html>

2 个解决方案

#1

edit/clarification: calllback functions takes two arguments, the second one is value of the variable. Use it instead of this I have tested both variants and everything seems to work as expected (strings are still strings).

编辑/澄清:calllback函数有两个参数,第二个是变量的值。使用它而不是这个我测试了两个变体,一切似乎按预期工作(字符串仍然是字符串)。

>>> $.each(['foo','bar'], function(i, s){ console.info( s, typeof s ) })
foo string
bar string

>>> $(['foo','bar']).each(function(i, s){ console.info( s, typeof s ) })
foo string
bar string

#2

This works in my Firefox 3.5:

这适用于我的Firefox 3.5:

$(function(){
    var foo = [];

    foo.push("abc");
    foo.push("def");

    $.each(foo, function(i){
        console.log(typeof ("" + this)); 
        });
});

The console shows

控制台显示

string
string

#1