document.write('<div>解析：</div><div>function getStyle(obj,attr,value){</div><div>&nbsp;if(!value){</div><div>&nbsp;if(obj.currentStyle){</div><div>&nbsp;return obj.currentStyle(attr);</div><div>&nbsp;} else{</div><div>&nbsp;obj.getComputedStyle(attr,false);</div><div>&nbsp;}</div><div>&nbsp;} else{</div><div>&nbsp;obj.style[attr]=value;</div><div>&nbsp;}</div><div>}&nbsp;</div>');