js中设置元素class的方法

1.

var div = document.getElementById('d1');div.setAttribute("class", "abc"); 

2.

var div = document.getElementById('d1');div.setAttribute("className", "abc");

3.

var div = document.getElementById('d1'); div.setAttribute("className", "abc"); 

4.

var imgdiv = document.createElement("div");imgdiv.className = "imgdiv";imgdiv.style.width = "50%";imgdiv.style.height = "50%";imgdiv.style.float = "left";var img = document.createElement("img");img.src = src;img.style.width = '100%';prvbox.appendChild(imgdiv).appendChild(img);