识别浏览器的JavaScript引擎的方法

window.onload = function() { 
 var v8string = 'function%20javaEnabled%28%29%20%7B%20%5Bnative%20code%5D%20%7D'; 
 
 if (window.devicePixelRatio) //If WebKit browser 
 { 
 if (escape(navigator.javaEnabled.toString()) === v8string) 
 { 
 display('V8 detected'); 
 } 
 else 
 { 
 display('JSC detected'); 
 } 
 } 
 else { 
 display("Not a WebKit browser"); 
 } 
 
 function display(msg) { 
 var p = document.createElement('p'); 
 p.innerHTML = msg; 
 document.body.appendChild(p); 
 } 
 
};