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var queue = function(funcs, scope) {  
    (function next() {  
          if(funcs.length > 0) {  
              funcs.shift().apply(scope || {}, [next].concat(Array.prototype.slice.call(arguments, 0)));  
          }  
    })();  
};  
 
var obj = {  
    value: null 
};  
 
queue([  
    function(callback) {  
        var self = this;  
        setTimeout(function() {  
            self.value = 10;  
            callback(20);  
        }, 200);  
    },  
    function(callback, add) {  
        console.log(this.value + add);  
        callback();  
    },  
    function() {  
        console.log(obj.value);  
    }  
], obj);