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JS 参考手册
Input Checkbox checked 属性
tryjsref_checkbox_checked
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<!DOCTYPE html> <html> <body> Checkbox: <input type="checkbox" id="myCheck"> <p>Click the "Try it" button to find out whether the checkbox is checked, or not.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myCheck").checked; document.getElementById("demo").innerHTML = x; } </script> </body> </html>