使用window.getSelection().toString()方法来获取选中的文字，在选中文字鼠标松开后会获取到选中的文字：
<p>可以选中一些文本</p>
<script type="text/javascript">
let selected = window.getSelection().toString()
console.log(selected)
if(selected != '' &&selected != null){
window.alert('要百度搜索吗?')
}
</script>
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二、让内容可编辑
第一步：为元素设置contenteditable属性并赋值为true，让元素具有可编辑功能，当将其值赋值为false时不可编辑；
第二步：伪元素设置spellcheck属性，并赋值为true，即开启拼写检查，设置值为false时关闭拼写检查
**注意：**浏览器定义了多文本编辑命令，使用dicument,execCommand()可以调用（比如copy,selectAll等命令；在使用execCommand()方法时，界面元素的contenteditable属性值不能设置为true，否则会影响copy命令）
<div contenteditable="true" spellcheck="true"></div>
<button>提交</button>
<script type="text/javascript">
let div = document.querySelector('div')
let btn = document.querySelector('button')
btn.onclick = function(){
console.log(div.innerText)
}
</script>
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三、JS动画
原理：通过定时器setInterval()不断移动盒子位置。
例：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
.box1{
width: 200px
height: 200px
position: absolute
top: 50px
background-color: #3B78DD
}
.box2{
width: 100px
height: 100px
position: absolute
top: 400px
background-color: lightblue
}
button{
position: absolute
top: 300px
}
</style>
</head>
<body>
<div class="box1"></div>
<div class="box2"></div>
<button>点击移动box2</button>
<script type="text/javascript">
let box1 = document.querySelector('.box1')
let box2 = document.querySelector('.box2')
let btn = document.querySelector('button')
function animate(obj, disdance, speed){
clearInterval(obj.timer)
obj.timer = setInterval(function(){
let moving = obj.offsetLeft
moving += 1
obj.style.left = moving + 'px'
if(moving >disdance){
clearInterval(obj.timer)
}
},speed)
}
animate(box1,300,5)
btn.onclick = function(){
animate(box2,400,3)
}
</script>
</body>
</html>
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用JavaScript动态改变按钮文字上面的颜色：<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
function initArray() {
for (var i = 0i <initArray.arguments.lengthi++) {
this[i] = initArray.arguments[i]
}
this.length = initArray.arguments.length
}
var colors = new initArray(
"red",
"blue",
"green",
"purple",
"black",
"tan",
"yellow",
"lime",
"coral",
"palegreen",
"silver",
"gold",
"red")
delay = .5// seconds
link = 0
vlink = 0
function linkDance() {
link = (link+1)%colors.length
vlink = (vlink+1)%colors.length
document.linkColor = colors[link]
document.vlinkColor = colors[vlink]
setTimeout("linkDance()",delay*1000)
}
linkDance()
// End -->
</script>
