1 (function(window) { 2 var core_ArrPro = Array.prototype; 3 var core_slice = core_ArrPro.slice; 4 var core_push = core_ArrPro.push; 5 var core_unshift = core_ArrPro.unshift; 6 7 function StringBuffer() { 8 this.buffer = []; 9 } 10 StringBuffer.prototype = { 11 push: function() { 12 core_push.apply(this.buffer, core_slice.call(arguments)); 13 return this; 14 }, 15 unshift: function() { 16 core_unshift.apply(this.buffer, core_slice.call(arguments)); 17 return this; 18 }, 19 toString: function() { 20 return this.buffer.join(''); 21 } 22 }; 23 return window.StringBuffer = StringBuffer; 24 })(window); 25 document.getElementById('result').innerHTML = new StringBuffer().push('asdasd').unshift('654', 123).push(123, 564, 'sdf');
由于apply效率低于call，而大多push操作只有1个参数，随更新为如下：
(function(window) { var core_ArrPro = Array.prototype; var core_slice = core_ArrPro.slice; function StringBuffer() { this.buffer = []; } StringBuffer.prototype = { push: function() { if(arguments.length == 1){ this.buffer.push(arguments[0]) }else if(arguments.length > 1){ this.buffer = this.buffer.concat(core_slice.call(arguments)); } return this; }, unshift: function() { if(arguments.length == 1){ this.buffer.unshift(arguments[0]) }else if(arguments.length > 1){ this.buffer = core_slice.call(arguments).concat(this.buffer) } return this; }, toString: function() { return this.buffer.join(''); } }; return window.StringBuffer = StringBuffer; })(window); document.getElementById('result').innerHTML = new StringBuffer().push('asdasd').unshift('654', 123).push(123, 564, 'sdf');