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Input Checkbox indeterminate 属性
tryjsref_checkbox_indeterminate
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<!DOCTYPE html> <html> <body> Checkbox: <input type="checkbox" id="myCheck"> <p>Click the buttons to set or return the indeterminate state of the checkbox.</p> <button onclick="myFunction()">Return state</button> <button onclick="myFunction2()">Set state</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myCheck").indeterminate; document.getElementById("demo").innerHTML = x; } function myFunction2() { var x = document.getElementById("myCheck").indeterminate = true; } </script> </body> </html>