<html>
<style>
div {
margin:20px;
height: 70px;
border: 1px solid green;
outline: 1px solid red;
outline-offset: -4px;
}
:focus {
background-color: blue;
};
</style>
<script>
function focused(event){
debugger;
console.log('event: ' + event);
}
</script>
<body>
<div tabindex="3">3</div>
<div tabindex="-1">0</div>
<button onfocus="focused(event)">test</button>
</body>
</html>
成功触发：
事件类型为focus：
对应的是onblur：
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