百度描点

var sevenWordLength = $(‘#list_seven‘).height();
var eightTop = $(‘.step_eight‘).offset().top;
var temp_seven = $(‘.circle‘).height()-50;
$(‘#list_seven .cur_seven‘).each(function(i){
var sevenWordTop = $(this).find(‘.word‘).offset().top;
var temp_sevens = $(this).find(‘.circle‘).height()+10;
temp_seven = temp_seven+temp_sevens;
if(scroH>=sevenWordTop && scroH<eightTop){
$(this).find(‘.circle‘).css({position:‘fixed‘,background:‘#5BC648‘,top:temp_seven,left:‘21.4%‘});
}else {
$(this).find(‘.circle‘).css({position:‘absolute‘,background:‘#D0D0D0‘,top:‘-20px‘,left:‘0px‘});
}
});

});
});

百度描点

原文：http://www.cnblogs.com/qiuchunxia/p/6071574.html