Prototype - startsWith() 方法

此方法检查字符串是否以子字符串开头。

语法

string.startsWith(substring);

返回值

返回布尔值。

示例

<html>
   <head>
      <title>Prototype examples</title>
      <script type = "text/javascript" src = "/javascript/prototype.js"></script>
      
      <script>
         function showResult() {
            var str = "Prototype JavaScript";
            alert ("First Check : " + str.startsWith("JavaScript") );
            alert ("Second Check : " + str.startsWith("Prototype") );
         }
      </script>
   </head>

   <body>
      <p>单击按钮查看结果。</p>
      <br />
      <br />
      <input type = "button" value = "Result" onclick = "showResult();"/>
   </body>
</html>