JavaScript Memoization
var Every = function(array, callback, thisObject){
if(array.every){
return array.every(callback, thisObject);
}else{
for (var i = 0, len = array.length; i < len; i++) {
if(!callback.call(thisObject, array[i], i, array)) return false;
}
return true;
}
}
function Memoize(func, object){
var caches = [];
return function(){
var args = Array.prototype.slice.call(arguments), len = args.length;
for (var i = 0, n = caches.length; i < n; i++) {
var argC = caches[i]["args"];
if( argC.length == len && Every(argC, function(x, i){ return x === args[i]; })) return caches[i]["result"];
}
var result = func.apply(object, arguments);
caches.push({"args": args, "result": result});
return result;
}
}
function fib(n){
if (n == 0 || n == 1) return 1;
return fib(n-1) + fib(n-2);
}
fib = Memoize(fib);
if(array.every){
return array.every(callback, thisObject);
}else{
for (var i = 0, len = array.length; i < len; i++) {
if(!callback.call(thisObject, array[i], i, array)) return false;
}
return true;
}
}
function Memoize(func, object){
var caches = [];
return function(){
var args = Array.prototype.slice.call(arguments), len = args.length;
for (var i = 0, n = caches.length; i < n; i++) {
var argC = caches[i]["args"];
if( argC.length == len && Every(argC, function(x, i){ return x === args[i]; })) return caches[i]["result"];
}
var result = func.apply(object, arguments);
caches.push({"args": args, "result": result});
return result;
}
}
function fib(n){
if (n == 0 || n == 1) return 1;
return fib(n-1) + fib(n-2);
}
fib = Memoize(fib);
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程序中包含的js工具库CJL.0.1.min.js,原文在这里。