getJSON获取所有项目但有未定义的错误

Question

I'm using getJSON for my JSON data items, like this:

$.getJSON(projects, function (json) {
        var firstThree = json.sort(function(a, b) { return a.Variable1 < b.Variable1 ? 1 : -1; })
        .slice(0, 3);
        var related = firstThree;
        var i = '';
        $.each(json, function(i) {
            var sizeClass = JSON.stringify(related[i].pname);
            console.log('sifzdfze'+sizeClass);
        });

I checked on console, getting sizeClass item, it works. But but it also shows an error:

 related[i] is undefined

What's the problem? Thanks!

Answer 1

As per your code you are accessing related as an array. So you are supposed to iterate over the items in the array. In your case related[i] is undefined because you are trying to access an item that is out of bounds of the particular array.

$.each(json, function(i) {

supposed to be

$.each(related, function(val, i) {

Also the above line, creates an i that is scoped to the each callback. So there is not need to declare it in the line above. Here val is the current value in iteration whose index is i . It can be simplified as

$.each(related, function(val, i) {
   var sizeClass = JSON.stringify(val.pname);