dom

 111

var ul = document.createElement('ul')

var li = document.createElement('li')

ul.appendChild(li)

修改标签的全部class
ul.className = 'c1'  //为ul添加一个class='c1'
ul.className = 'c2'  //修改ul的class为class='c2'

添加删除标签的某个class
ul.classList.add('c2')     //<ul class=​"c1 c2">​…​</ul>​
ul.classList.remove('c1')    //<ul class=​"c2">​…​</ul>​

对标签添加或修改样式
ul.style.width = '32px    // <ul class=​"c2" style=​"​ 32px;​">​…​</ul>​
ul.style.background = '#eee'   //<ul class=​"c2" style=​"​ 32px;​ background:​ rgb(238, 238, 238)​;​">​…​</ul>​

ul.style.removeProperty('width')  //<ul class=​"c2" style=​"background:​ rgb(238, 238, 238)​;​">​…​</ul>​

d.className = 'd1'
"d1"
d
<div class=​"d1">​</div>​
d.className = 'd2'
"d2"
d
<div class=​"d2">​</div>​
d.classList.add('d3')
undefined
d
<div class=​"d2 d3">​</div>​
d.className = 'dd'
"dd"
d
<div class=​"dd">​</div>​
d.className = 'dd ddd'
"dd ddd"
d
<div class=​"dd ddd">​</div>​

function Go(){var content = '欢迎老男孩';var first_chr = content[0];var sub = content.substring(1,content.lenth);content = sub + first_chr;}

function Action(){ setInterval('Go()',1000)}