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Window History 对象
tryjsref_his_length1
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<!DOCTYPE html> <html> <body> <h1>The Window History Object</h1> <h2>The history.length Property</h2> <p>Number of URLs in history list:</p> <p id="demo"></p> <p>Since this is a new window frame, history.length will always return 1.</p> <script> let length = history.length; document.getElementById("demo").innerHTML = length; </script> </body> </html>