/*
官网原文:
In JScript, global functions cannot be iterated using the global this object.
Example:
*/
<script>
var __global__ = this;
function invisibleToIE()
{
document.write("IE can't see me");
}
__global__.visibleToIE = function()
{
document.write("IE sees me");
}
for (func in __global__)
{
var f = __global__[func];
if (func.match(/visible/))
{
f();
}
}
</script>
/*
Output:
IE: IE sees me
FF: IE sees meIE can't see me
Opera: IE can't see meIE sees me
Safari: same as Opera IE incorrectly
/*
官网原文:
IE incorrectly implements the delete operator when applied to the global object. Attempting to execute delete this.invisibleToIE in the example below produces a runtime error (object doesn‟t support this action) in IE while in FF delete returns false. The FF behaviour seems correct according to §11.4.1, §10.2.1, and §8.6.2.5
Example:
*/
<script>
var __global__ = this;
function invisibleToIE()
{
document.write("IE can't see me");
}
__global__.visibleToIE = function()
{
document.write("IE sees me");
}
document.write(delete this.invisibleToIE);
</script>
/*
Output:
IE: runtime error (object doesn‟t support this action)
FF: false
Opera: same as FF
Safari: same as FF
*/
/*
官网原文：
In IE the global object does not inherit from Object.prototype even though its “type” is object. §15 – paragraph 8 seems to imply that the “Global Object” should inherit from Object.prototype (the value of its [[Prototype]] property is implementation dependent, but what ever it is it must be a “built-in prototype” and hence must follow the rules of paragraph 8. Of the standard methods of Object.prototype, the only one support by the global object in IE is toString Example:
*/
<script>
var __global__ = this;
document.write(typeof(__global__) + '<br>');
var f =['toString', 'toLocaleString', 'valueOf', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable'];
for (i = 0; i < f.length; i++)
{
test(f[i]);
}
function test(s)
{
if (__global__[s])
{
document.write(s + ' supported' + '<br>');
}
}
</script>
/* Output:
IE: object toString supported
FF: object toString supported toLocaleString supported valueOf supported hasOwnProperty supported isPrototypeOf supported propertyIsEnumerable supported
Opera: same as FF
Safari: same as FF
*/
