如何在on("mouseenter") 2秒后延迟？

Question

这是我的代码。

在第4行，我想在鼠标进入lastItemsLink 2秒后运行this.openList。

我怎样才能做到这一点？

lastItemsLink = $(".last-items"),
openLastItemsList = {
    init: function() {
        lastItemsLink.on("mouseenter", this.openList);
        lastItemsLink.on("mouseleave", this.closeList);
    },
    openList: function() {
        lastItemsContainer.stop(false, true).slideDown("fast");
    },
    closeList: function() {
        lastItemsContainer.stop(false, true).fadeOut("fast");
    }
};

Answer 1

你可能需要做类似的事情

lastItemsLink = $(".last-items"),
openLastItemsList = {
    init: function () {
        lastItemsLink.on("mouseenter", this.openList);
        lastItemsLink.on("mouseleave", this.closeList);
    },
    openList: function () {
        openLastItemsList.timer = setTimeout(function () {
            lastItemsContainer.stop(false, true).slideDown("fast");
            delete openLastItemsList.timer;
        }, 2000)
    },
    closeList: function () {
        if (openLastItemsList.timer) {
            clearTimeout(openLastItemsList.timer)
        } else {
            lastItemsContainer.stop(false, true).fadeOut("fast");
        }
    }
};

演示：小提琴

Answer 2

使用setTimeout：

lastItemsLink.on("mouseenter", function () {
    setTimeout(this.openList, 2000)
});

Answer 3

尝试 .delay() 函数 点击这里

this.delay(2000).openList

也许可以尝试一下...

Answer 4

解决方案：

$('#a').mouseenter(e => {
    if (timeout != null) { clearTimeout(timeout); }
    timeout = setTimeout(function () {
        console.log('mouseenter after delay');
    }, 500);
})
.mouseleave(e => { if (timeout != null) { clearTimeout(timeout); timeout = null; } });
var timeout; 

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="a">[Hover at me]</div>