js中用cssText设置css样式的简单方法

var obj = document.getElementByIdx_x_x('no');
obj.style.width = '400px';
obj.style.height = '300px';

var obj = document.getElementByIdx_x_x('no');
function setStyle(obj, css) {
for(var attr in obj){
obj.style[attr] = css[attr];
}
}
setStyle(obj,{width:"400px",height:"300px"});

var obj = document.getElementByIdx_x_x('no');
obj.style.cssText = "width:400px; height:300px;";