<form name="form1" id="form1">      <input type="radio" name="sex" value="1">男　 <input type="radio" name="sex" value="0">女　  </form>  <script>      window.onload=function(){          var sex=1          var ridaolen=document.form1.sex.length;          for(var i=0;i<ridaolen;i++){              if(sex==document.form1.sex[i].value){                  document.form1.sex[i].checked=true              }          }               }  </script>