Javascript 对象和 Internet Explorer

Question

I have this code:

 jsonObj = [];
 $("#test").find('.data').each(function() {

    var description = $(this).find('.description').val();
    var food = $(this).find('.food').val();

    item = {}
    item ["description"] = description;
    item ["food"] = food;

    jsonObj.push(item);
});

Internet explorer 11 inserts empty/null values. of-course it works well in chrome firefox or even in edge

Answer 1

I can replicate the issue using your code in this fiddle in IE11.

The problem is that you haven't declared item , and so you're using a global item (thanks to The Horror of Implicit Globals ¹ ), which is predefined in IE11 as a native function you can't overwrite or add properties to (this one , according tothis page ). It's not predefined (or is overwritable) in other browsers.

The lesson here is: Declare your variables . :-) If you do that, it works on IE11 as well ( updated fiddle ):

 var jsonObj = []; // *** $("#test").find('.data').each(function() { var description = $(this).find('.description').val(); var food = $(this).find('.food').val(); var item = {} // *** item ["description"] = description; item ["food"] = food; jsonObj.push(item); }); $("<pre>").text("Result: " + JSON.stringify(jsonObj, null, 2)).appendTo(document.body);

 <div id="test"> <div class="data"> <input type="text" class="description" value="description1"> <input type="text" class="food" value="food1"> </div> <div class="data"> <input type="text" class="description" value="description2"> <input type="text" class="food" value="food2"> </div> <div class="data"> <input type="text" class="description" value="description3"> <input type="text" class="food" value="food3"> </div> </div> <script src="https://code.jquery.com/jquery-3.1.1.js"></script>

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¹ That's a post on my anemic little blog.