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How to control the title and add information through Js code

一个新手Original: 2017-10-10 10:02:111561browse

Achieve the effect

showTitle: When the display title button is clicked, all The title is displayed
hideTitle: When the hide title button is clicked, all titles are hidden
addCity: When the add city button is clicked , a new city name

<!DOCTYPE html>
    <html lang="en">
    <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no">
    <title></title>
    <script>
        //        function showTitle() {
        //            var titleElement = document.getElementById("title");
        //            titleElement.style.display = "block";
        //        }
        //
        //        function hideTitle() {
        //            var titleElement = document.getElementById("title");
        //            titleElement.style.display = "none";
        //        }

        function addCity() {
            var newElement = document.createElement("li"); // <li></li>
            var textNode = document.createTextNode("重庆"); // 重庆
            newElement.appendChild(textNode); // <li>重庆</li>

            document.getElementById("city").appendChild(newElement);
        }    </script></head><body><h3 id="title" style="display: block">八维学院</h3><h3 id="title222" style="display: block">八维学院222</h3><p>选择城市</p><ul id="city">
    <li>北京</li>
    <li id="city_2">上海</li>
    <li>天津</li></ul><input type="button" onclick="showTitle()" value="显示标题"/><input type="button" onclick="hideTitle()" value="隐藏标题"/><input type="button" onclick="addCity()" value="添加城市"/><script>
    /*window.document.getElementById("title");*/
    var arr = document.getElementsByTagName("h3");
    console.log(arr[0]);
    console.log(arr[1]);</script></body></html>

will be created under the original city list.

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