使用JS记忆函数功能，能够有效提供代码的性能。
1 <!DOCTYPE html>
2 <html lang="en">
3 <head>
4 <meta charset="UTF-8">
5 <title>记忆函数</title>
6 </head>
7 <body>
8
9 </body>
10 </html>
11 <script>
12 /**
13 * 记忆函数
14 * */
15 function memoize(fn){
16 return function(){
17 var propertyName;
18 fn.storage = fn.storage || {};
19
20 propertyName = Array.prototype.join.call(arguments,"|");
21
22 if(propertyName in fn.storage){
23 return fn.storage[propertyName];
24 }else{
25 fn.storage[propertyName] = fn.apply(this,arguments);
26 return fn.storage[propertyName];
27 }
28 }
29 }
30
31 /**
32 * 计算阶乘的函数
33 * @param num
34 * @returns {number}
35 */
36 function getFactorial(num){
37 var result = 1,
38 index = 1;
39 for(;index <=num;index++){
40 result *= index;
41 }
42 return result;
43 }
44
45 var calcFn = memoize(getFactorial);
46 debugger;
47 calcFn(5);
48 calcFn(5);
49
50 </script>
时间： 2024-10-06 20:46:09