firefox火狐浏览器与与ie兼容的2个问题总结

function addCSSRule(css,key,value){
//var css = document.styleSheets[document.styleSheets.length-1];
if(navigator.userAgent.indexOf("Firefox")>0 )
{
css.insertRule(key+"{"+value+"}", css.cssRules.length)
}
else
{
css.addRules(key,value);
}
}
function removeCSSRule(key){
for(var i = 0; i < document.styleSheets.length; i++){
var css = document.styleSheets[i];
navigator.userAgent.indexOf("Firefox")>0 ?
(function(){
for(var j = 0; j < css.cssRules.length; j++){
if(css.cssRules[j].selectorText==key){
css.deleteRule(j);
}
}
})() :
(css.removeRule(key)) ;
}
}

function getCurrentStyle(oElement) {
if(navigator.userAgent.indexOf("Firefox")>0 ){
var rgbstr=document.defaultView.getComputedStyle(oElement,null).backgroundColor;
var strR;
if(rgbstr.toString().indexOf('(')>0 && rgbstr.toString().indexOf(')')>0)
{
strR= rgbstr.toString().substring(parseInt(rgbstr.toString().indexOf('(')+1),rgbstr.toString().indexOf(')')).split(',');
}
return toHexColor(strR[0],strR[1],strR[2]).substring(1);
}
else{
return oElement.currentStyle.backgroundColor.trim().substring(1);
}
}

function toHexColor(r,g,b){
var hex='#';
var hexStr = '0123456789ABCDEF';
low = r % 16;
high = (r - low)/16;
hex+=hexStr.charAt(high) + hexStr.charAt(low);
low = g % 16;
high = (g - low)/16;
hex+=hexStr.charAt(high) + hexStr.charAt(low);
low = b % 16;
high = (b - low)/16;
hex+=hexStr.charAt(high) + hexStr.charAt(low);
return hex;
}