（javascript）如何获取我选择的元素的ID？

Question

let's say I selected a bunch of elements by class. how do i find out what the ID is of each of my returned elements?

Answer 1

Access the id property

for (var i = 0; i < elements.length; ++i) {
    elements[i].id
}

or

for (var i = 0; i < elements.length; ++i) {
   elements[i].getAttribute('id');
}

Answer 2

Try this :

 function selectedDivs (theClass) {
                         var allHTMLTags=document.getElementsByTagName("div");

                        for (i=0; i<allHTMLTags.length; i++) {
                        //Get all tags with the specified class name.
                        if (allHTMLTags[i].className==theClass) {
                        allHTMLTags[i].getAttribute('id');
                        }
                        }
                        }