<script type="text/javascript">
  var oBox = document.getElementById('box');
  var oDiv = document.getElementById('div1');
  var aInput = document.getElementsByTagName('input');
  var aAttr = ['width', 'height', 'backgroundColor', 'display', 'display'];
  var aValue = ['200px', '200px', 'red', 'none', 'block'];
  for(var len=aInput.length,i=0;i<len;i++){
    aInput[i].index = i; //索引
    aInput[i].onclick = function(){
      //重置按钮,cssText清空DIV属性
      if(this.index == aInput.length - 1)oDiv.style.cssText = "";
      //设置DIV属性
      property(oDiv, aAttr[this.index], aValue[this.index]);
    };
  }
  //控制DIV属性
  function property(obj, attr, value){
    obj.style[attr] = value;
  }
</script>