javascript中级--事件--键盘控制

一、键盘控制div

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        #div1 {
            width: 100px;
            height: 100px;
            background: red;
            position: absolute;
        }
    </style>
    <script>
        document.onkeydown = function(ev) {
            var oDiv = document.getElementById('div1');
            var oEvent = ev || event;
            // alert(oEvent.keyCode); //←37↑38→39↓40
            // alert(oDiv.offsetWidth);
            // return false;
            if (oEvent.keyCode == 37) {
                oDiv.style.left = oDiv.offsetLeft - 10 + 'px';
            } else if (oEvent.keyCode == 39) {
                oDiv.style.left = oDiv.offsetLeft + 10 + 'px';
            }
        }
    </script>
</head>

<body>
    <div id="div1"></div>
</body>

</html>

 二、ctrl+回车发送消息

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script>
        window.onload = function() {
            var oTxt1 = document.getElementById('txt1');
            var oTxt2 = document.getElementById('txt2');
            var oBtn = document.getElementById('btn1');
            oBtn.onclick = function() {
                oTxt1.value += oTxt2.value + '\n';
                oTxt2.value = "";
            }
            oTxt1.onkeydown = function() {
                return false;
            }
            oTxt2.onkeydown = function(ev) {
                var oEvent = ev || event;
                if (oEvent.ctrlKey && oEvent.keyCode == 13) { //ctrlKey   shiftKey  按着返回true 不按返回false
                    oTxt1.value += oTxt2.value + '\n';
                    oTxt2.value = "";
                }
            }
        }
    </script>
</head>

<body>
    <textarea id="txt1" rows="10" cols="30"></textarea>
    <br>
    <input id="txt2" type="text" name="" value="">
    <input id="btn1" type="button" value="输入">
</body>

</html>

 

posted @ 2017-03-07 13:48  Mr_W_Blog  阅读(150)  评论(0)    收藏  举报