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<title>jquery支持返回顶部效果绿色简洁在线客服代码</title>
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<span>汪先生:</span>
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$(function(){
$(document).scroll(function(){
var scrollTop = $(document).scrollTop(),bodyHeight = $(window).height();
if(scrollTop > bodyHeight){
$('.fixed-bar .gotop').css('display','block');
}else{
$('.fixed-bar .gotop').css('display','none');
}
})
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