怎么设置块里面的内容块都水平垂直居中
window.onload=function(){ var obox=document.getElementById("box"); //外框块 var oantzone=document.getElementById("antzone"); //目标块 var w=oantzone.offsetWidth; var h=oantzone.offsetHeight; oantzone.style.position="absolute"; oantzone.style.left="50%"; oantzone.style.top="50%"; oantzone.style.marginLeft=-(w/2)+"px"; oantzone.style.marginTop=-(h/2)+"px"; }