JavaScript:当我从iframe函数传递数组时,数组会失去他的类型! [英] JavaScript: when I pass array from iframe function the array lose his type!
问题描述
我在表单中有一个iframe。
iframe包含一些我希望通过Array实例传递给父表单的信息。
问题:Array实例丢失了它的类型并成为一个对象!
iframe函数:
I have an iframe in a form. The iframe contains some info that I want deliver to the form parent by instance of Array. The problem: the Array instance loses it's type and becomes an object! The iframe function:
function getIDS2() { return new Array(); }
父母代码:
alert(top.frames["sup_search"].getIDS2() instanceof Array);
当然警报的答案是假的...
所以,我可以解决它通过这样做:
Of course the answer for the alert is false... So, I can fix it by doing this:
var arr = [];
for(var i =0; i < SuppliersIDs.length; i+=1) {
arr.push(SuppliersIDs[i]);
}
其中,SuppliersIDs是交付的数组,arr是新的真实类型数组。
但为什么这不符合我的要求呢?
顺便问一下,有没有办法用jQuery访问iframe函数?
Where SuppliersIDs is the delivered array and arr is the new true type array. But why is this not working as I want it to? By the way, is there any there a way to access the iframe func with jQuery??
感谢您的帮助。
推荐答案
因为每个页面都有一个带有自己Array函数的全局上下文,如果一个页面上的代码将一个数组传递给一个单独页面上的函数,那么该测试array instanceof Array将失败。对于数组,你可以这样做:
Because each page has a global context with its own "Array" function, if code on one page passes an array to a function on a separate page, the test "array instanceof Array" will fail. For Array you can do this instead:
var arr = top.frames["sup_search"].getIDS2();
var isArray = arr && Object.prototype.toString.call(arr)=="[object Array]";
感觉hacky但是有效。
It feels hacky but it works.
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