javascript jQuery $.each 变量作用域
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jQuery $.each variable Scope
提问by wesside
Having a scope issue problem with a $.eachloop in jQuery. How can I get a global variable in a function to set in a loop or at least pass something out of it?
jQuery 中的$.each循环存在范围问题。如何在函数中获取全局变量以在循环中设置或至少从中传递一些内容？
var some_function = function() {
// false by default
var something = false;
$.each(array, function(key, val) {
if (val == 'something')
{
// even if one item evaluates true I need to check outside of the loop
something = true;
}
});
if (something == true)
{
// do something else, but always false
}
}
Since I'm needing to evaluate all items in the array, and if only one istrue, then do something additional, outside of the $.each.
由于我需要评估数组中的所有项目，如果只有一个是true，那么在$.each.
Update
更新
$(document).ready(function () {
something();
$(':radio').trigger('change');
)};
Ok, so this is the actual code. It's alerting 'false'at the bottom and then alerts 'hello'twice, as if it's going in reverse order.
好的，这是实际的代码。它在底部警告“假”，然后警告“你好”两次，就好像它以相反的顺序进行。
var something = function() {
var q_radios = {
'radio1' : 'radio1_selector',
'radio2' : 'radio2_selector',
};
var show_me = false;
$.each(q_radios, function(name, q_selector) {
$('input:radio[name=' + q_selector + ']').change(function() {
show_me = true;
alert('hello');
});
});
if (show_me == true)
{
alert('yes');
}
else
{
alert('false');
}
};
采纳答案by Quentin
More or less, exactly what you have now … you just need to pass the data into the function (by letting it accept an argument). See a live example.
或多或少，正是您现在拥有的……您只需要将数据传递给函数（通过让它接受一个参数）。查看一个活生生的例子。
var some_function = function(array) {
// false by default
var something = false;
$.each(array, function(key, val) {
if (val == 'something') {
something = true;
}
});
if (something == true) {
alert("There was a something");
} else {
alert("There wasn't a something");
}
};
some_function([1,2,3]);
some_function([1,"something",3]);
?
回答by ?ime Vidas
I recommend native Array iteration methods:
我推荐原生数组迭代方法：
var something = array.some(function ( val ) {
return val === 'something';
});
Here, somethingwill be trueif at least one array element has the value 'something'.
这里，something将true如果至少一个数组元素具有值'something'。
