jquery verifies that checkbox is selected code recommendation _jquery

The average person verifies that this is the idea:

Copy Code code as follows:

Whether the function chk ()//is checked to verify that there is a selected return True, no return false
{
var falg = 0;
$ ("Input[name=cbname]:checkbox"). each (function () {
if ($ (this). attr ("checked"))//This can be used if ($ ("#cr"). Is (": Checked"))
{
Falg +=1; Here you can add return False to exit the loop
}
})
if (Falg >0)
return true;
Else
return false;
}

This is a good idea, but I think the following code is simpler and more efficient:
if ($ ("Input[name=cbname]:checkbox"). length==0)//No selection of any items
According to the requirements of the choice