原生计算浏览器高度

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EventUtil.addHandler(window,'scroll',function(){

 

    var dafid = document.getElementById('dafid'),

        eletop = dafid.getBoundingClientRect().top;

        if(eletop-549 <= 0){

            dafid.className = 'daf';

        }else{

            dafid.className = '';

        }

 

});