<!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>地图栏</title>
</head>
<body>
<!-- 为 ECharts 准备一个具备大小（宽高）的 DOM -->
<div id="main" style="width: 600px;height:400px;"></div>
<div style="display: flex;" id='iptBox'>
美国：<input id="countryA" value=10 /> 日本：
<input id="countryJ" value=14 /> 中国：
<input id="countryC" value=18 /> 德国：
<input id="countryD" value=12 />
</div>
</body>
<script src="https://cdn.bootcdn.net/ajax/libs/echarts/5.0.1/echarts.common.js"></script>
<script>
var myChart = echarts.init(document.getElementById('main'));
var AGDP = document.getElementById('countryA').value;
var JGDP = document.getElementById('countryJ').value;
var CGDP = document.getElementById('countryC').value;
var DGDP = document.getElementById('countryD').value;
var arrGDP = [AGDP, JGDP, CGDP, DGDP];
var iptBox = document.getElementById('iptBox');
var option = {
title: {
text: '面试题1'
},
tooltip: {
},
legend: {
data: ['GDP']
},
xAxis: {},
yAxis: {
data: ['美国', '日本', '中国', '德国']
},
series: [{
name: 'GDP',
type: 'bar',
data: arrGDP
}]
}
myChart.setOption(option, true)
//通过事件委托来修input的value值 减少DOM操作来优化性能
iptBox.addEventListener('change', (e) => {
let ev = e || window.event;
console.log(ev.target.id == 'countryA')
let elId = ev.target.id
switch (elId) {
case 'countryA':
arrGDP[0] = ev.target.value
break;
case 'countryJ':
arrGDP[1] = ev.target.value
break;
case 'countryC':
arrGDP[2] = ev.target.value
break;
case 'countryD':
arrGDP[3] = ev.target.value
break;
}
option.series[0].data = arrGDP
myChart.setOption(option, true)
})
</script>
</html>
