作业:获取input中的value的值

2018-03-02  本文已影响0人  那一份美好

作业:<input id="study" value="666"> 用js获取input的值,有一个按钮叫弹出,点击弹出,展示出input中的value的值?

解答:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>Examples</title>
<meta name="description" content="">
<meta name="keywords" content="">
<link href="" rel="stylesheet">
<style type="text/css">

</style>
</head>
<body>
    <input id="study" value="666">
    <input type="button" value="弹出" id="button">
    <script>
        document.getElementById("button").onclick = function () {
            alert(document.getElementById("study").value)
        }
    </script>
</body>
</html>

引入变量:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>Examples</title>
<meta name="description" content="">
<meta name="keywords" content="">
<link href="" rel="stylesheet">
<style type="text/css">

</style>
</head>
<body>
    <input id="study" value="666">
    <input type="button" value="弹出" id="button">
    <script>
        var button =    document.getElementById("button")
        var study =   document.getElementById("study")
    button.onclick = function () {
            alert(study.value)
        }
    </script>
</body>
</html>
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