使用new運算符與變量

Question

我想要做這樣的事情：

var foo = function(){ 
    this.value = 1; 
} 
var bar = "foo"; 
var baz = new bar(); 
alert(baz.value)  // 1 

從本質上講，我想從它的名字的字符串版本創建一個新的對象。有任何想法嗎？

Answer 1

var foo = function(){ 
    this.value = 1; 
}; 
var bar = "foo"; 
var baz = new this[bar](); // "this" here refers to the global object (you could also use "window", but "this" is shorter) 
alert(baz.value)  // 1 

參見http://blog.brett-zamir.me/?p=24