jQuery源码分析17: .toggle()
jQuery.extend({
// A global GUID counter for objects
guid: 1,
});
jQuery.fn.extend({
toggle: function( fn ) {
// Save reference to arguments for access in closure
var args = arguments,
guid = fn.guid || jQuery.guid++,
i = 0,
toggler = function( event ) {
// Figure out which function to execute
var lastToggle = ( jQuery._data( this, "lastToggle" + fn.guid ) || 0 ) % i;
jQuery._data( this, "lastToggle" + fn.guid, lastToggle + 1 );
// Make sure that clicks stop
event.preventDefault();
// and execute the function
return args[ lastToggle ].apply( this, arguments ) || false;
};
// link all the functions, so any of them can unbind this click handler
toggler.guid = guid;
while ( i < args.length ) {
args[ i++ ].guid = guid;
}
return this.click( toggler );
},
});
// Save the old toggle function
_toggle: jQuery.fn.toggle,
toggle: function( fn, fn2, callback ) {
var bool = typeof fn === "boolean";
if ( jQuery.isFunction(fn) && jQuery.isFunction(fn2) ) {
this._toggle.apply( this, arguments );
} else if ( fn == null || bool ) { //< 当调用$(elem).toggle([true|false|\s*]);时相当于.show(),.hide()
this.each(function() {
var state = bool ? fn : jQuery(this).is(":hidden");
jQuery(this)[ state ? "show" : "hide" ](); //< <==> jQuery(this)['show'](),jQuery(this)['hide']()
});
} else {
this.animate(genFx("toggle", 3), fn, fn2, callback);
}
return this;
},