<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
select {
width: 200px;
height: 200px;
background-color: #33cccc;
font-size: 20px;
}
</style>
</head>
<body>
<select id="all" size="5" multiple="multiple">
<!-- multiple可以实现多选效果 -->
<!-- <option>苹果</option>
<option>橘子</option>
<option>梨</option>
<option>西瓜</option>
<option>水蜜桃</option> -->
</select>
<input type="button" value=">>" id="btn1">
<input type="button" value="<<" id="btn2">
<input type="button" value=">" id="btn3">
<input type="button" value="<" id="btn4">
<select id="choose" multiple="multiple">
</select>
<script>
var all = document.getElementById("all");
var choose = document.getElementById("choose");
var btn1 = document.getElementById("btn1");
var btn2 = document.getElementById("btn2");
var btn3 = document.getElementById("btn3");
var btn4 = document.getElementById("btn4");
var options = ["苹果","橘子","西瓜","梨","水蜜桃"];
for(var i=0;i<options.length;i++){
var option = document.createElement("option");
option.innerText = options[i];
all.appendChild(option);
}
//btn1移动all中所有元素到choose中
btn1.onclick = function(){
var opts = all.children; //内部的元素是动态添加的
//获取最初的数组长度
var n = opts.length;
for(var i=0;i<n;i++){
choose.appendChild(opts[0]);
}
};
//btn2
btn2.onclick = function(){
var opts = choose.children; //内部的元素是动态添加的
//获取最初的数组长度
var n = opts.length;
for(var i=0;i<n;i++){
all.appendChild(opts[0]);
}
};
//btn3单选/多选(Ctrl)
btn3.onclick = function(){
var opts = all.children;
//将需要移动的元素放到数组中
var arr= [];
for(var i =0;i<opts.length;i++){
if(opts[i].selected == true){
arr.push(opts[i]);
}
}
console.log(arr);
for(var j=0;j<arr.length;j++){
choose.appendChild(arr[j]);
arr[j].selected = false;
}
};
//btn4
btn4.onclick = function(){
var opts = choose.children;
var arr=[];
for(var i=0;i<opts.length;i++){
if(opts[i].selected == true){
arr.push(opts[i]);
}
}
console.log(arr);
for(var j = 0;j<arr.length;j++){
all.appendChild(arr[j]);
arr[j].selected = false;
}
}
</script>
</body>
</html>
