var dv = document.getElementById('div-name')
dv.style.display="none";
document.getElementsByClassName("class-name")
//Emlement后面有s的,添加样式的时候要[0]选择
class-name.cssText = "width:100px; height:100px; display:block;"
class-name[0].innerHTML = '插入的内容';
插入内容->innerHTML
改变样式->.style.stylepro=""
元素.onmouseout
元素.onmouseover= function(){
mydiv.style.background = 'blue';
}
window.onresize浏览器窗口变化
var setWrap = function(){
if($(window).width >1260 ){
$("body").attr("class","w1260");
}else{
$("body").attr("class","w990");
}
}
setWrap();
$(window).on("resize","setWrap");