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Javascript Form - 如何get value属性获取在密码框中输入的值...

form 【form】
我们想知道如何get value属性获取在密码框中输入的值。...
代码展示 运行结果 

    <html>
    <body>
    <script language = "JavaScript">

    function checkName(){
         var firstName = document.formEx.first.value;
         var lastName = document.formEx.last.value;
         console.log("The name you entered is: " + firstName + " " + lastName);
    }
    </script>
    <form name="formEx">
    First Name:
    <input type="text" name="first" size="20">
    Last Name:
    <input type="text" name="last" size="25">
    <br><br>
    Click the button to check that the information is correct.
    <br>
    <input type="button" value="verify" name="check" onClick='checkName()'>
    </form>
    </body>
    </html>