在jquery的github上查看effects.js,你会发现在赋值后更改变量会有问题。
来源:https://github.com/jquery/jquery/blob/master/src/effects.js
注意:请注意.animate中的赋值和对象创建到Animation(工作马)。
animate: function( prop, speed, easing, callback ) {
var empty = jQuery.isEmptyObject( prop ),
optall = jQuery.speed( speed, easing, callback ),
doAnimation = function() {
var anim = Animation( this, jQuery.extend( {}, prop ), optall );
if ( empty ) {
anim.stop( true );
}
};
return empty || optall.queue === false ?
this.each( doAnimation ) :
this.queue( optall.queue, doAnimation );
}
//在effects.js中执行动画
function Animation( elem, properties, options ) {
var result,
index = 0,
length = animationPrefilters.length,
deferred = jQuery.Deferred().always( function() {
delete tick.elem;
}),
tick = function() {
var currentTime = fxNow || createFxNow(),
remaining = Math.max( 0, animation.startTime + animation.duration - currentTime ),
temp = remaining / animation.duration || 0,
percent = 1 - temp,
index = 0,
length = animation.tweens.length;
for ( ; index < length ; index++ ) {
animation.tweens[ index ].run( percent );
}
deferred.notifyWith( elem, [ animation, percent, remaining ]);
if ( percent < 1 && length ) {
return remaining;
} else {
deferred.resolveWith( elem, [ animation ] );
return false;
}
},
animation = deferred.promise({
elem: elem,
props: jQuery.extend( {}, properties ),
opts: jQuery.extend( true, { specialEasing: {} }, options ),
originalProperties: properties,
originalOptions: options,
startTime: fxNow || createFxNow(),
duration: options.duration,
tweens: [],
createTween: function( prop, end ) {
var tween = jQuery.Tween( elem, animation.opts, prop, end,
animation.opts.specialEasing[ prop ] || animation.opts.easing );
animation.tweens.push( tween );
return tween;
},
stop: function( gotoEnd ) {
var index = 0,
length = gotoEnd ? animation.tweens.length : 0;
for ( ; index < length ; index++ ) {
animation.tweens[ index ].run( 1 );
}
if ( gotoEnd ) {
deferred.resolveWith( elem, [ animation, gotoEnd ] );
} else {
deferred.rejectWith( elem, [ animation, gotoEnd ] );
}
return this;
}
}),
props = animation.props;
propFilter( props, animation.opts.specialEasing );
for ( ; index < length ; index++ ) {
result = animationPrefilters[ index ].call( animation, elem, props, animation.opts );
if ( result ) {
return result;
}
}
createTweens( animation, props );
if ( jQuery.isFunction( animation.opts.start ) ) {
animation.opts.start.call( elem, animation );
}
jQuery.fx.timer(
jQuery.extend( tick, {
anim: animation,
queue: animation.opts.queue,
elem: elem
})
);
return animation.progress( animation.opts.progress )
.done( animation.opts.done, animation.opts.complete )
.fail( animation.opts.fail )
.always( animation.opts.always );
}
因此,我认为你将不得不使用.stop并重新排队动画,以改变变量,因为你几乎没有希望访问闭包中的任何变量(请有经验的人纠正我)