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dist/scripts/expand.js

@@ -0,0 +1,26 @@
+var array = {
+    expand : function(source,size){
+        var target = new Array(size);
+        var span = (size / source.length);
+        for(var i = 0 ; i < source.length ;i++ ){
+            var range = [ Math.floor(i * span) , Math.floor(( i + 1 ) * span)];
+            target.fill(source[i],...range);
+        }
+        return target;
+    },
+    extract : function(source,size){
+        var target = new Array(size);
+        var span = (source.length / size);
+        for(var i = 0 ; i < size ;i++ ){
+            var range = [ Math.floor(i * span) , Math.floor(( i + 1 ) * span)];
+            target[i] = Math.max.apply(null,source.slice(...range));
+        }
+        return target;
+    }
+  }
+//   数组原型对象重新赋值一个函数,   新定义的expand与extract是要赋值的函数
+  Array.prototype.expand = function (size) { return array.expand(this,size);}
+  Array.prototype.extract = function (size) { return array.extract(this,size);  }
+
+  Uint8Array.prototype.__proto__.expand = function (size) { return array.expand(this,size);}
+  Uint8Array.prototype.__proto__.extract = function (size) { return array.extract(this,size);  }