自动生成文章摘要[JavaScript 版本]

function Generate_Brief(text,length){
    if(text.length < length) return text;
    var Foremost = text.substr(0,length);
            
    var re = /<(\/?)(BODY|SCRIPT|P|DIV|H1|H2|H3|H4|H5|H6|ADDRESS|PRE|TABLE|TR|TD|TH|INPUT|SELECT|TEXTAREA|OBJECT|A|UL|OL|LI|BASE|META|LINK|HR|BR|PARAM|IMG|AREA|INPUT|SPAN)[^>]*(>?)/ig;
    
    var Singlable = /BASE|META|LINK|HR|BR|PARAM|IMG|AREA|INPUT/i
    var Stack = new Array(), posStack = new Array();
    while(true){
        var newone = re.exec(Foremost);
        if(newone == null) break;
        
        if(newone[1] == ""){
            var Elem = newone[2];
            if(Elem.match(Singlable) && newone[3]!= ""){
                continue;
            }
            Stack.push(newone[2].toUpperCase());
            posStack.push(newone.index);
            
            if(newone[3] == "") break;
        }else{
            var StackTop = Stack[Stack.length-1];
            var End  = newone[2].toUpperCase();
            if(StackTop == End){
                Stack.pop();
                posStack.pop();
                if(newone[3] == ""){
                    Foremost = Foremost+">";
                }
            }
            
        };
    }    
    var cutpos = posStack.shift();
    Foremost = Foremost.substring(0,cutpos);
    
    return Foremost;
}