js 获取checkBox值，以及对checkBox进行赋值

</pre><p><pre name="code" class="html"><form><input type="checkbox" value="Benz" name="car" />I have a Benz<input type="checkbox" value="bmw" name="car" />I have a bmw<input type="checkbox" value="bieke" name="car" />I have a bieke </br><button id="btn1" onclick="clickclick()">复选框获取值</button><button id="btn" onclick="checkTheBox()">复选框赋值</button></form>

function clickclick(){var id = document.getElementsByName('car');var value = new Array();for(var i = 0; i < id.length; i++){if(id[i].checked){value.push(id[i].value);}        }        var tt = value.toString()  ;}function checkTheBox(){var typeStr = "Benz,bieke";var cbArray = typeStr.split(",");  var str=document.getElementsByName("car");  var objarray=str.length;  for(i=0;i<cbArray.length;i++){  for (j=0;j<objarray;j++){  if(str[j].value == cbArray[i]){str[j].checked = true;  }  }  }  }