JS Checkbox全选

checkbox全选 < head ></ head > < SCRIPT  LANGUAGE ="JavaScript" > <!--  Beginvar checkflag = "false";function check(field) {if (checkflag == "false") {for (i = 0; i < field.length; i++) {field[i].checked = true;}checkflag = "true";return "false"; }else {for (i = 0; i < field.length; i++) {field[i].checked = false; }checkflag = "false";return "true"; }}//  End  --> </ script > < body ></ body > < form  name ="form"  method ="post"  action ="" > < input  type ="checkbox"  name ="list"  value ="1" > < input  type ="checkbox"  name ="list"  value ="2" > < input  type ="checkbox"  name ="list"  value ="3" > < input  type =checkbox  value ="全选"  onClick ="this.value=check(this.form.list)" > //这个FORM不是FORM名字                  选中所有显示记录