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JS延时器提示框的应用实例代码解析_javascript技巧

WBOY
Release: 2016-05-16 15:03:33
Original
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废话不多说了,直接给大家贴代码了,具体代码如下所示:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>延时显示提示框</title>
<style>
#div1 {
float: left;
width: 60px;
height: 60px;
background-color: aqua;
}
#div2 {
position: relative;
float: left;
margin: 0 10px;
width: 200px;
height: 200px;
background-color: #cccccc;
display: none;
}
</style>
<script>
window.onload = function () {
var oDiv1 = document.getElementById('div1');
var oDiv2 = document.getElementById('div2');
var timer = null;
// oDiv1.onmouseover = function () {
// clearTimeout(timer);
// oDiv2.style.display = 'block'; //鼠标移入div1时显示div2
// };
//
// oDiv1.onmouseout = function () {
// timer = setTimeout(function () {
// oDiv2.style.display = 'none'; //鼠标移除div1时隐藏div2
// }, 500); //为了从div1移入div2,所以移出div1时div2隐藏应该有一个延时设置
// };
//
// oDiv2.onmouseover = function () {
// clearTimeout(timer); //清除延时器设置,当鼠标移入div2时,div2应当显示
// };
//
// oDiv2.onmouseout = function () {
// timer = setTimeout(function () {
// oDiv2.style.display = 'none'; //当鼠标移出div2时,div2应当隐藏
// }, 500); //当鼠标移出div2并移入div1时,div2会闪烁一下再显示,设置一个延时,清除闪烁的效果;
// // 但是设置延时器之后,鼠标移入div1时,div2却隐藏了,原因是setTimeout,
// // 应当清除延时器,在oDiv1.onmouseover事件中添加,清除延时器的代码
// };
// 由于这四个事件中代码两两对应地相同或相似,可以做如下简化处理:
oDiv1.onmouseover = oDiv2.onmouseover = function () {
clearTimeout(timer);
oDiv2.style.display = 'block';
/* 鼠标移入div1时显示div2,虽然oDiv2.onmouseover事件中没有写oDiv2.style.display = 'block';
但是实际上oDiv2是'block'状态,多写一句代码没有实质性影响*/
};
oDiv1.onmouseout = oDiv2.onmouseout = function () {
timer = setTimeout(function () {
oDiv2.style.display = 'none'; //鼠标移除div1时隐藏div2
}, 500); //为了从div1移入div2,所以移出div1时div2隐藏应该有一个延时设置
};
// 简化后的代码执行结果跟前面的代码效果完全一致.
}
</script>
</head>
<body>
<h2>延时提示框</h2>
<div id="div1"></div>
<div id="div2"></div>
</body>
</html> 
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延时提示框编写时需要注意的点都记录在注释当中,逐个对照注意一下,这个功能看过视频教程之后实现起来比较顺畅,原因是在编写代码之前对所需功能做了一个列表按照列表一一实现,出现问题再进行相应的调整比上来直接写代码强多了。

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