// 动态加载外部js文件
var flag = true
if( flag ){
loadScript( "js/index.js" )
}
function loadScript( url ){
var script = document.createElement( "script" )
script.type = "type/javascipt"
script.src = url
document.getElementsByTagName( "head" )[0].appendChild( script )
}
// 动态加载js
if( flag ){
var script = document.createElement( "script" )
script.type = "text/javascript"
script.text = " "
document.getElementsByTagName( "head" )[0].appendChild( script )
}
// 动态加载外部css样式
if( flag ){
loadCss( "css/base.css" )
}
function loadCss( url ){
var link = document.createElement( "link" )
link.type = "text/css"
link.rel = "stylesheet"
link.href = url
document.getElementsByTagName( "head" )[0].appendChild( link )
}
// 动态加载css样式
if( flag ){
var style = document.createElement( "style" )
style.type = "text/css"
document.getElementsByTagName( "head" )[0].appendChild( style )
var sheet = document.styleSheets[0]
insertRules( sheet,"#gaga1","background:#f00",0 )
}
function insertRules( sheet,selectorTxt,cssTxt,position ){
if( sheet.insertRule ){ // 判断非IE浏览器
sheet.insertRule( selectorTxt + "{" + cssTxt +"}" ,position )
}else if( sheet.addRule ){ //判断是否是IE浏览器
sheet.addRule( selectorTxt ,cssTxt ,position )
}
}
不生效的原因定位，可以从以下几点入手： 确认引入的外部CSS文件确实存在，并且引入路径正确 因CSS有引入的先后顺序和效果应用优先级，所以需确保引入的CSS必须放在其他CSS文件或样式的后面 具体的style优先级高于CSS文件的优先级
