JQuery .jquery用法及代碼示例

var a = { what: "A regular JS object" },
  b = $( "body" );
 
if ( a.jquery ) { // Falsy, since it's undefined
  alert( "a is a jQuery object!" );
}
 
if ( b.jquery ) { // Truthy, since it's a string
    alert( "b is a jQuery object!" );
}

alert( "You are running jQuery version: " + $.fn.jquery );