原型为数组的JavaScript对象成员将被所有类实例共享
<html><head><script type="text/javascript">function print_r( title, object ) {
var output = '';
for( var key in object ) {
output += key + ": " + object[ key ] + "\n";
}
output = title + "\n\n" + output;
alert( output );}function Sandwich() {
// Uncomment this to fix the problem
//this.ingredients = [];}Sandwich.prototype = {
"ingredients" : [],
"addIngredients" : function( ingArray ) {
for( var key in ingArray ) {
this.addIngredient( ingArray[ key ] );
}
},
"addIngredient" : function( thing ) {
this.ingredients.push( thing );
}}var cheeseburger = new Sandwich();cheeseburger.addIngredients( [ "burger", "cheese" ] );var blt = new Sandwich();blt.addIngredients
( [ "bacon", "lettuce", "tomato" ] );var spicy_chicken_sandwich = new Sandwich();spicy_chicken_sandwich.addIngredients(
[ "spicy chicken pattie", "lettuce", "tomato", "honey dijon mayo", "love" ] );var onLoad = function() {
print_r( "Cheeseburger contains:", cheeseburger.ingredients );};</script></head><body onload="onLoad();"></body></html>POPMUISE
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