此JavaScript代码没有错误，但无法正常工作。 有看不到的秘密错误吗？

Question

I have this JavaScript code I've been using for weeks now and no error has ever occurred with it but now all of a sudden it just doesn't work! Here is the code itself:

 function DB(name) { this.name = name; this.content = []; this.add = function(value) { this.content.push(value); } this.get = function(id) { return this.content[id]; } } var name = new DB("Names DB"); name.add("Test Name"); 

Answer 1

If you're executing this code in the global scope, name already exists as window.name . Therefore, name = new DB("Names DB") coerces the second half into a string and you essentially run name = '[object Object]' .

Wrap everything in a function to use a non-global scope:

(function() {
    // Your code
})();

Or choose a different variable name.

Answer 2

That code is in conflict with attribute window.name you need to enclose your code in a function or drastically remove the attribute name from window object.

 delete window.name; // Remove attribute. function DB(name) { this.name = name; this.content = []; this.add = function(value) { this.content.push(value); } this.get = function(id) { return this.content[id]; } } var name = new DB("Names DB"); name.add('Test Name');