JavaScript For and for in loop Management

Window. onload = Init; function Init () {/*** pay attention to the use of the For Loop and for in loop ** for in loop with arrays or objects, but for nodelist, there is no problem under Firefox, but there will be a problem under ie * at this time we need to use a general for loop to filter ** for example, to get all the input elements on the page, then filter out the selected multiple selection boxes *****/var list = document. getelementsbytagname ("input"); For (VAR I = 0; I <list. length; I ++) // here we 'd better use a general for loop {If (list [I]. type = "radio" & list [I]. checked = true) {alert (list [I]. name); S1 [J ++] = list [I]. name;} If (list [I]. type = "checkbox" & list [I]. checked = true) {alert (list [I]. name); S2 [k ++] = list [I]. name ;}}}