// Create a new user object that accepts an object of properties
function User( properties ) {
// Iterate through the properties of the object, and make sure
// that it's properly scoped (as discussed previously)
for ( var i in properties ) {
// Create a new getter for the property
this[ "get" + i ] = function() {
return properties[i];
}; // Create a new setter for the property
this[ "set" + i ] = function(val) {
properties[i] = val;
};
}
}// Create a new user object instance and pass in an object of
// properties to seed it with
var user = new User({
name: "Bob",
age: 44
});// Just note that the name property does not exist, as it's private
// within the properties object
alert( user.name == null );// However, we're able to access its value using the new getname()
// method, that was dynamically generatedalert( user.getname() == "Bob" );//为什么user.getname() 取的是user.getage()的值???????????? // Finally, we can see that it''s possible to set and get the age using
// the newly generated functions
user.setage( 22 );alert( user.getage() == 22 );
// Iterate through the properties of the object, and make sure
// that it's properly scoped (as discussed previously)
for ( var i in properties ) {
//闭包外,i的值还没变
// Create a new getter for the property
this[ "get" + i ] = function() {
//闭包内,i的值在进闭包的时候已经改变,和外面的i的值不同,这里要用以个变量来记录外面传进来的i值,就不会出错了
return properties[i];
}; // Create a new setter for the property
this[ "set" + i ] = function(val) {
properties[i] = val;
};
}
} // Create a new user object instance and pass in an object of
// properties to seed it with
var user = new User({
name: "Bob",
age: 44
}); // Just note that the name property does not exist, as it's private
// within the properties object
alert( user.name == null ); // However, we're able to access its value using the new getname()
// method, that was dynamically generated alert( user.getname() == "Bob" );//为什么user.getname() 取的是user.getage()的值???????????? // Finally, we can see that it''s possible to set and get the age using
// the newly generated functions
user.setage( 22 ); alert( user.getage() == 22 );
function User( properties ) {
//遍历对象属性,确保它作用域正确
for ( var i in properties ) { (function(which){ var p=i
//为属性创建获取器
which[ "get" + i ] = function() {
return properties[p];
};
//为属性创建设置器
which[ "set" + i ] = function(val) {
properties[p] = val;
};
})(this); }
}
var user = new User({
name: "Bob",
age: 44
});
alert( user.name == null );
alert( user.getname() == "Bob" );
user.setage( 22 );
alert( user.getage() == 22 );
</script>
(function(i) {
// Create a new getter for the property
this[ "get" + i ] = function() {
return properties[i];
};
// Create a new setter for the property
this[ "set" + i ] = function(val) {
properties[i] = val;
};
})(i);
}