下面是我的一些测试结果 [h3]Array & Object constructing[/h3] 构造数组和对象的时候，new Array() and new Object()要比 [] and {}慢3倍的时间 [h3]Index Number type for Arrays[/h3] 数组的数字索引类型 ist[int(0)] 比list[0]要快 [h3]Create Array vs. Updating Array[/h3] 再循环语句中避免多次创建数组，最好创建一次用多次更新内容替换 Nulling Array vs. Splicing Array 对于庞大的数组而言就行splice操作是比较耗成本的，要尽量避免 When working with large Arrays splicing is obviously an expensive operation, you can avoid this by nulling the index and skipping it in a null scenario. If you need to splice in order to keep the Array length low. Then store these nulled indexes in another trash Array once the garbage count has reached a limit you've defined loop through the numerically sorted trash indexes deleting splices in bulk. This concept is demonstrated in Tweensy.   [h3]Nulling Object vs. Delete Object[/h3] delete一个对象的属性要比把该属性设置为null 更昂贵，所以对于对象的属性最好设置为null [h3]Nesting Loops（嵌套循环）[/h3] 多次嵌套循环效率差，所以最好保证循环在2层以内   [h3]Inline code vs. function references[/h3] 如果在时间帧上的函数很长而且执行时间长，最好，把该函数分成多个小的函数执行。   这样可以缩短执行时间提高效率 [h3]Arguments vs. variable referencing[/h3] 尽量最小化函数的参数个数     [h3]Function apply scoping do it or not?[/h3] Scoping function.apply is a little bit slower than not so if you don't have to then don't.     [h3]Array push vs. Array index[/h3] 用设置index的方式来代替使用数组函数push 比如 list[list.length] = data; 要比直接用push快600%；   [h3]Array emptying - length 0 vs. A new Array[/h3] 如果你需要设置一个空数组，有一个方便的办法去选择，就是通过设置它的length属性为0 或者你会认为这么做是不错的选择，原因是它能节省内存，但是事实上这样做的执行速度不如直接new array的效率高 当然，如果你需要在一次循环中清除多于510个数组为空时，用length设置为0的时候会更好   [h3]Var declarations on multiple lines vs. Var declarations on a single line[/h3]   将变量声明在一行中，要比声明多行更好，效率更高 i.e. [code]var a:int=0, b:int=0, c:int=0; [/code] vs. [code]var a:int=0; var b:int=0; var c:int=0;[/code]   [code] [/code] [h3]Using Xor to swap variables[/h3]如果你想去交换变量，但是又不想创建新的变量的时候，可以用xor 如：  a = a^b; b = a^b; a = a^b;   [h3]Multiplication vs. Division[/h3]乘法的运算速率总是比出发快，比如5000/1000 要比 [code]5000*0.001快130%；[/code]     [code] [/code] [h3]Type casting comparison 强制转换类型对比[/h3]When type casting the keyword [code]as[/code] is 250% more efficient than casting by [code]Type(item);[/code] Though surprisingly not using either is about 1400% more efficient.   建议使用对应的类型的变量进行比较 同类型的比较效率高的多     [h3]Long vs Short variable names[/h3]尽量用短的变量名