解决方法
只要看mouSEOwn和mouseup，并计算差额。
Here’s an example。
(function() {
// how many milliseconds is a long press?
var longpress = 3000;
// holds the start time
var start;
jQuery( "#pressme" ).on( 'mousedown',function( e ) {
start = new Date().getTime();
} );
jQuery( "#pressme" ).on( 'mouseleave',function( e ) {
start = 0;
} );
jQuery( "#pressme" ).on( 'mouseup',function( e ) {
if ( new Date().getTime() >= ( start + longpress ) ) {
alert('long press!');
} else {
alert('short press!');
}
} );
}());
