/*
官网原文:
Custom properties that shadow [[DontEnum]] properties on Object.prototype are not enumerated using for-in. In the following example toString is a property available on Object.prototype and is shadowed on cowboy. Since such properties are not enumerated through for-in, it is not possible to transfer them from a one object to another using for-in.
*/
function cowboy()
{
this.toString = function ()
{
return "cowboy";
}
this.shoot = function ()
{
return "bang!";
}
}
var p = new cowboy();
document.write("Enumerable properties:");
for (var i in p)
{
document.write(" ", i);
}
document.write("<br/>cowboy propertyIsEnumerable(\"toString\"): ", p.propertyIsEnumerable("toString"));
document.write("<br/>cowboy propertyIsEnumerable(shoot): ", p.propertyIsEnumerable("shoot"));
document.write("<br/>cowboy hasOwnProperty(\"toString\"): ", p.hasOwnProperty("toString"));
/*
IE: Enumerable properties:
shoot cowboy propertyIsEnumerable("toString"):false
cowboy hasOwnProperty("toString"): true
FF: Enumerable properties:
toString shoot cowboy propertyIsEnumerable("toString"): true c
owboy hasOwnProperty("toString"): true
Opera: same as FF
Safari: same as FF
*/
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