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task14.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Task 14</title>
</head>
<body>
<h3>污染城市列表</h3>
<ul id="aqi-list">
<!--
<li>第一名:福州(样例),10</li>
<li>第二名:福州(样例),10</li> -->
</ul>
<script>
var aqiData = [
["北京", 90],
["上海", 50],
["福州", 10],
["广州", 50],
["成都", 80],
["西安", 100]
];
function renderFilteredData() {
var ul = document.getElementById("aqi-list");
function compare(arr1, arr2){
return arr1[1] - arr2[1];
}
//先筛选再排序
var sortedAqiData = aqiData.filter(function(item){
return item[1] > 60;
}).sort(compare);
//将排序结果插入文档片段
var fragment = document.createDocumentFragment();
for(var i = 0, len = sortedAqiData.length; i < len; i++){
var li = document.createElement("li");
var item = sortedAqiData[i];
var text = "第" + (i+1) + "名:" + item[0] + ", " + item[1];
li.textContent = text;
fragment.appendChild(li);
}
//将文档片段插入文档
ul.appendChild(fragment);
}
window.addEventListener('load', renderFilteredData);
</script>
</body>
</html>