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jquery 实现抖动效果
jQuery.fn.shake = function (intShakes /*Amount of shakes*/, intDistance /*Shake distance*/, intDuration /*Time duration*/) {  
    this.each(function () {  
        var jqNode = $(this);  
        jqNode.css({ position: 'relative' });  
        for (var x = 1; x <= intShakes; x++) {  
            jqNode.animate({ left: (intDistance * -1) }, (((intDuration / intShakes) / 4)))  
            .animate({ left: intDistance }, ((intDuration / intShakes) / 2))  
            .animate({ left: 0 }, (((intDuration / intShakes) / 4)));  
        }  
    });  
    return this;  
}

调用方法:

$("抖动元素").shake(次数, 距离, 持续时间);

$("#userName").shake(2, 10, 400);

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