(a) whether the most property in an array or an object is a test that adds a comma

1, conclusion: There are compatibility problems in IE8, will be a comma after the empty also counted as an attribute, so the last attribute at the end do not add a comma

<! DOCTYPE html>    $(function(){        vardata = [            {                "Ahref": "javascript:;void (0)",                "Imgsrc": "Img/swiper01.jpg",            },{                "Ahref": "javascript:;void (0)",                "Imgsrc": "Img/swiper02.jpg",            },{                "Ahref": "javascript:;void (0)",                "Imgsrc": "Img/swiper03.jpg",            },{                "Ahref": "javascript:;void (0)",                "Imgsrc": "Img/swiper04.jpg",            },{                "Ahref": "javascript:;void (0)",                "Imgsrc": "Img/swiper05.jpg",            },        ]; Console.log (data.length)//1. Chrome:5        //2. Firefox:5        //3. Ie:6        //haha this really note that the proposal regardless of the array or object, the last element does not add a comma    });</script>
(a) whether the most property in an array or an object is a test that adds a comma