此方法使用正则表达式检查字符串是否为有效的 JSON。此安全方法在内部调用。
string.isJSON();
返回一个布尔值。
<html> <head> <title>Prototype examples</title> <script type = "text/javascript" src = "/javascript/prototype.js"></script> <script> function showResult() { var str = "something"; alert("something.isJSON() : " + str.isJSON()); var str = "\"something\""; alert("\"something\" : " + str.isJSON()); var str = "{ foo: 42 }"; alert("{ foo: 42 } : " + str.isJSON()); var str = "{ \"foo\": 42 }"; alert("{ \"foo\": 42 } : " + str.isJSON()); } </script> </head> <body> <p>Click the button to see the result.</p> <br /> <br /> <input type = "button" value = "Result" onclick = "showResult();"/> </body> </html>