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Details open 属性
tryjsref_details_open2
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<!DOCTYPE html> <html> <body> <details id="myDetails"> <summary>Copyright 1999-2014.</summary> <p> - by Refsnes Data. All Rights Reserved.</p> <p>All content and graphics on this web site are the property of the company Refsnes Data.</p> </details> <p>Click the "Try it" button to specify that the details should be visible (open) to the user.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { document.getElementById("myDetails").open = true; } </script> </body> </html>