java.js

来自「这是《JavaScript学习源代码》一书的源代码」· JavaScript 代码 · 共 7 行

// test if Java is enabled in the browser
if ( !navigator.javaEnabled() ) 
{ 
  var warning = "It appears Java is not enabled in your browser.\n";
  warning += "Some items on this page cannot run without Java";           
  alert(warning);
}