javascript的简单查询和插入和修改

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Untitled Document</title>
    <link rel="stylesheet" type="text/css" href="style/css.css" />
    <script type="text/javascript">

        window.onload = function() {

            //创建一个"广州"节点,添加到#city下
            myClick("btn01",function(){
                var li = document.createElement("li");
                var gz = document.createTextNode("广州");
                li.appendChild(gz);
                var city = document.getElementById("city");
                city.appendChild(li);
            });
            myClick("btn02",function(){
                var li = document.createElement("li");
                var gz = document.createTextNode("广州");
                li.appendChild(gz);
                var city = document.getElementById("city");
                city.insertBefore(li,bj);
            });
            myClick("btn03",function(){
                var li = document.createElement("li");
                var gz = document.createTextNode("广州");
                li.appendChild(gz);
                var city = document.getElementById("city");
                city.replaceChild(li,bj);
            });
            myClick("btn04",function(){
                var city = document.getElementById("city");
                city.removeChild(bj);
            });
            myClick("btn04",function(){
                var city = document.getElementById("city");
                city.removeChild(bj);
            });
            myClick("btn05",function(){
                var city = document.getElementById("city");
                // var cns = city.children;
                // for (let i=0;i<cns.length;i++)
                // console.log(cns[i].innerHTML)
                alert(city.innerText)
            });
            myClick("btn06",function(){
                var bj = document.getElementById("bj");
                bj.innerHTML="长坡";
            });
            myClick("btn07",function(){
                var city = document.getElementById("city");
                city.innerHTML+="<li>广州</li>";
            });

        };

        function myClick(idStr, fun) {
            var btn = document.getElementById(idStr);
            btn.onclick = fun;
        }


    </script>

</head>
<body>
<div id="total">
    <div class="inner">
        <p>
            你喜欢哪个城市?
        </p>

        <ul id="city">
            <li id="bj">北京</li>
            <li>上海</li>
            <li>东京</li>
            <li>首尔</li>
        </ul>

    </div>
</div>
<div id="btnList">
    <div><button id="btn01">创建一个"广州"节点,添加到#city下</button></div>
    <div><button id="btn02">将"广州"节点插入到#bj前面</button></div>
    <div><button id="btn03">使用"广州"节点替换#bj节点</button></div>
    <div><button id="btn04">删除#bj节点</button></div>
    <div><button id="btn05">读取#city内的HTML代码</button></div>
    <div><button id="btn06">设置#bj内的HTML代码</button></div>
    <div><button id="btn07">创建一个"广州"节点,添加到#city下</button></div>
</div>
</body>
</html>
javascript的简单查询和插入和修改

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