如何在javascript中触发元素上的onmouseover事件？

Question

如标题所示，如何在javascript中触发元素上的onmouseover事件？请参阅Code Snippet。我可以点击小黑框并执行onmouseover事件，而不是悬停在大盒子上吗？目标不是将框变为蓝色，而是将onmouseover事件触发TRIGGER。而且我需要这只用JavaScript来完成，请不要Jquery。

function showBlue() {
	document.getElementById('xyz').style.background = "#425dff"; 
}
function showRed() {
	document.getElementById('xyz').style.background = "#e2e2e2";
}

#abc{width: 50px; height: 50px; background: #000000; color:#ffffff; cursor: pointer;}
#xyz{width: 200px; height: 200px; background: #e2e2e2;}

<div id="abc"><a>click me</a></div>

</br>

<div id="xyz" onmouseover="showBlue()" onmouseout="showGrey()"></div>

我尝试了这个，但对我不起作用:(

<script>
    document.getElementById('abc').addEventListener("click", triggerFunction);

    function triggerFunction() {
        document.getElementById('xyz').mouseover();
    }
</script>

Answer 1

这应该有效：

function showBlue() {
	document.getElementById('xyz').style.background = "#425dff"; 
}
function showGrey() {
	document.getElementById('xyz').style.background = "#e2e2e2";
}
function triggerMouseOver() {
    document.getElementById('xyz').onmouseover();
}

#abc{width: 50px; height: 50px; background: #000000; color:#ffffff; cursor: pointer;}
#xyz{width: 200px; height: 200px; background: #e2e2e2;}

<div id="abc" onclick="triggerMouseOver()"><a>click me</a></div>

</br>

<div id="xyz" onmouseover="showBlue()" onmouseout="showGrey()"></div>

您也可以这样做：

<div id="abc" onclick="document.getElementById('xyz').onmouseover()"><a>click me</a></div>

Answer 2

应该是onmouseover()而不是mouseover()

document.getElementById('xyz').onmouseover();