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实现

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<ul id="color-list">
<li>red</li>
<li>yellow</li>
<li>blue</li>
<li>green</li>
<li>black</li>
<li>white</li>
</ul>

<script>
(function () {
var color_list = document.getElementById('color-list');
color_list.addEventListener('click', showColor, true);
function showColor(e) {
var x = e.target;
if (x.nodeName.toLowerCase() === 'li') {
alert(x.innerHTML);
}
}
})();
</script>