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<!DOCTYPE html> <html> <body> <p>test() 方法如果找到匹配则返回 true，否则返回 false。</p> <p>单击该按钮可在字符串中搜索字符“e”。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var str = "The best things in life are free"; var patt = new RegExp("e"); var res = patt.test(str); document.getElementById("demo").innerHTML = res; } </script> </body> </html>