JavaScript under function declaration some summary _javascript tips

function Test () {
return 123;
}


Apparently, it's a function statement, what's down there?
var b=function () {return 123};


This everyone doubts, as if not a declaration, because the function does not have a name, but an anonymous function, OK, look again
var b=function test () {return 123};


This is not a function statement, as if, then I answer you "no"
alert (test);
var b=function test () {return 123};


Can be in no IE above any JS implementation to test, will report test undefined error, if so
var b=function test () {return 123};
alert (b);
alert (test);


The function test () {...} is displayed. Such a function tostring result, can be a second alert or an exception, why, that is, the function test () {return 123} is not a declaration, but a function object, put the reference in B. So it's not like declaring a function object bound to the test name, so why don't I call the IE test, because
alert (test);
var b=function test () {return 123};


IE will show the function, IE is stupid, does not distinguish between individual function declarations and = the right of the functions of the object difference, in addition, ie even support function String.prototype.test () {...} Such a statement, see IE JS bug is really a lot of, no wonder Wilson does not support ES4, have to make a es3.1 out, in fact, is their own bug modified version