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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//获取选中的文字function getSelectText(editor) {
if (!editor) return editor.focus()
if (editor.document && editor.document.selection)
return editor.document.selection.createRange().text
else if ("selectionStart" in editor)
return editor.value.substring(editor.selectionStart, editor.selectionEnd)
}
//调用方式
var text= getSelectText(document.getElementById("txtName"))
可以通过//var aArr = div.getElementsByTagName('a')
//for(var i=0i<aArr.lengthi++){ var aObj = aArr[i]}
} else if (document.selection) { //IE浏览器 考虑到Opera,应该放在后面
userSelection = document.selection.createRange()
var text = userSelection.text//获得文本
var htmlText = userSelection.htmlText//获得包含标签的内容
}