一道JS小考题

iteye_17346

于 2008-01-10 10:50:00 发布

阅读量244

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文章标签： prototype F#

< script >
function foo(){
  foo.abc = function (){alert('def')}
   this .abc = function (){alert('xyz')}
  abc = function (){alert('@@@@@')};
   var abc = function (){alert('$$$$$$')}
}
foo.prototype.abc = function (){alert(' 456 ');}
foo.abc = function (){alert(' 123 ');}
var f = new foo();
f.abc();
foo.abc();
abc();
</ script >

...
..
.

输出结果是：

< script >
function foo(){
  foo.abc = function (){alert('def')}
   this .abc = function (){alert('xyz')}
  abc = function (){alert('@@@@@')};
   var abc = function (){alert('$$$$$$')}
}
foo.prototype.abc = function (){alert(' 456 ');}
foo.abc = function (){alert(' 123 ');}
var f = new foo();
f.abc();   // alert('xyz')
foo.abc(); // alert('def')
abc(); // error -> abc is not defined
</ script >

没看懂，问题保留。