javascript从html代码中获取文字方法

function trimHtml(str){
    str = str.replace(/(\n)/g, "");
    str = str.replace(/(\t)/g, "");
    str = str.replace(/(\r)/g, "");
    str = str.replace(/<\/?[^>]*>/g, "");
    str = str.replace(/\s*/g, "");
    str = str.replace(/<[^>]*>/g,"");
    return str;
}