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$(function() { 
var mao = $("#" + getParam("m")); //获得锚点 
if (mao.length > 0) {//判断对象是否存在 
var pos = mao.offset().top; 
var poshigh = mao.height(); 
$("html,body").animate({ scrollTop: pos-poshigh-30 }, 3000); 
} 
});