Js中透过记忆来优化递归方法

Js中通过记忆来优化递归方法
var count =0;//记录遍历次数var fibonacci = function(n){count++;return n<2 ? n:fibonacci(n-1)+fibonacci(n-2);}//遍历11次后fibonacci()被调用了453次 ，我们调用了11次function menoizationMethod1(){var htmlStr = "";for ( var i = 0; i <=10; i++) {var tmp_count = count;htmlStr +="参数值："+i+"\t和："+fibonacci(i)+"\t该参数值下遍历次数："+ (count-tmp_count)+"\t累计遍历次数："+count+"<br/>";}document.getElementById("memoization1").innerHTML = htmlStr;count = 0;}

 <button onclick="menoizationMethod1();">传统递归</button>  <div id='memoization1'></div>

?2、求数字之和（同过记忆优化递归方法）

var count =0;//记录遍历次数var fibonacci2 =function(){var memo = [0,1];var fib = function(n){var result = memo[n];count++;if(typeof result !== 'number'){result = fib(n-1) + fib(n-2);memo[n] = result;}return result;}return fib;}();//遍历11次后fibonacci()被调用了29次 ，我们调用了11次function menoizationMethod2(){var htmlStr = "";for ( var i = 0; i <=10; i++) {var tmp_count = count;htmlStr +="参数值："+i+"\t和："+fibonacci2(i)+"\t该参数值下遍历次数："+ (count-tmp_count)+"\t累计遍历次数："+count+"<br/>";}document.getElementById("memoization2").innerHTML = htmlStr;count = 0;}

    <button onclick="menoizationMethod2();">记忆递归</button>    <div id='memoization2'></div>

3、形式一般化

//此类函数形式一般化var count =0;//记录遍历次数var memoizer = function (memo,fundamenta1){var shell = function(n){count++;var result = memo[n];if(typeof result !== 'number'){result = fundamenta1(shell,n);memo[n] = result;}return result;}return shell;}//计算数字累积和function memoizerSumMethod(){var htmlStr = "";var fib1 = memoizer([0,1],function(shell,n){return shell(n-1)+shell(n-2);});for ( var i = 0; i <=10; i++) {var tmp_count = count;htmlStr +="参数值："+i+"\t和："+fib1(i)+"\t该参数值下遍历次数："+ (count-tmp_count)+"\t累计遍历次数："+count+"<br/>";}document.getElementById("memoization3").innerHTML = htmlStr;count = 0;}//计算数字乘积（阶乘）function memoizerMultiplyMethod(){var htmlStr = "";var fib2 = memoizer([1,1],function(shell,n){return n*shell(n-1);});for ( var i = 0; i <=10; i++) {var tmp_count = count;htmlStr +="参数值："+i+"\t乘积："+fib2(i)+"\t该参数值下遍历次数："+ (count-tmp_count)+"\t累计遍历次数："+count+"<br/>";}document.getElementById("memoization4").innerHTML = htmlStr;count = 0;}

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    <button onclick="memoizerSumMethod();">计算数字累积和</button>    <div id='memoization3'></div>    <button onclick="memoizerMultiplyMethod();">计算数字累积和</button>    <div id='memoization4'></div>

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