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<!DOCTYPE html> <html> <body> <h2>JavaScript 变量</h2> <p>字符串用引号书写。</p> <p>数字不带引号。</p> <p id="demo"></p> <script> var pi = 3.14; var person = "John Doe"; var answer = 'Yes I am!'; document.getElementById("demo").innerHTML = pi + "<br>" + person + "<br>" + answer; </script> </body> </html>