function alignHeight(eleA,eleB,eleC){
  if(!document.getElementById(eleA)){return false;}
  if(!document.getElementById(eleB)){return false;}
  var heightA = document.getElementById(eleA).clientHeight;
  var heightB = document.getElementById(eleB).clientHeight;
  if(heightA > heightB){
    document.getElementById(eleB).style.height = heightA + "px";
    document.getElementById(eleA).style.height = heightA -3 + "px";
  }else{
    document.getElementById(eleA).style.height = heightB - 3 + "px";
    document.getElementById(eleB).style.height = heightB + "px";
  }
  document.getElementById(eleA).style.height =  document.getElementById(eleB).style.height
  document.getElementById(eleB).style.height =  document.getElementById(eleB).style.height
  document.getElementById(eleC).style.height =  document.getElementById(eleB).style.height
}
window.onload = function z_align(){
  alignHeight("auto_l","auto_c","auto_r"); //只需将需要对齐的两个模块的id写在此处即可。
}