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<!DOCTYPE html> <html> <body> <h2>JavaScript 字符串属性</h2> <p>length 属性返回字符串的长度：</p> <p id="demo"></p> <script> var txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; var sln = txt.length; document.getElementById("demo").innerHTML = sln; </script> </body> </html>