js灵活应用之checkbox全选的代码比较

function SelectAll()
...{
    var theform=document.Form1;
    if(theform.checkbox1.checked)
    ...{       
        for(var i=0;i < theform.elements.length;i++)
        ...{               
            if (theform.elements[i].type == 'checkbox') ...{ 
            var e = theform.elements[i];
            e.checked = true;
            }
        }
    }     
    else
    ...{
           for(var i=0;i < theform.elements.length;i++)
        ...{               
            if (theform.elements[i].type == 'checkbox') ...{ 
            var e = theform.elements[i];
            e.checked = false;
            }
        }
    } 
}

 

function ChooseAll(sel,check)
...{        
    var objtb=document.getElementById(sel);
    var num=objtb.getElementsByTagName("input");
    var check=document.getElementById(check);
    for(i=0;i<num.length;i++)
    ...{
    
        if(num[i].tagName=="INPUT")
        ...{
        
            if(check.checked==true)
            ...{num[i].checked=true;}
            else...{num[i].checked=false;}
        }
    }
}