var dragDiv = document.getElementById("dragDiv");
dragDiv.addEventListener("dragover", function (event) {
event.preventDefault(event);
console.log("over"); //拖动对象在放置对象上,一直执行
});
dragDiv.addEventListener("dragenter", function (event) {
event.preventDefault(event);
console.log("enter"); //拖动对象在放置对象上,执行一次
});
dragDiv.addEventListener("dragleave", function (event) {
event.preventDefault(event);
console.log("leave");//拖动对象离开了放置对象,执行一次
});