一开始少写了个分号(红色的),怎么搞都不对.
var style = document.createElement("STYLE");
document.body.appendChild(style);
style.onerror = function(){
alert("here1")
}
style.onreadystatechange = function(){
alert("here2");
}
var sheet = style.styleSheet || style.sheet;
if(sheet.addImport)
sheet.addImport("aa.css");
else
sheet.insertRule("@import url('aa.css');",sheet.cssRules.length);