匿名函数

window.onload = function(){
    var odiv = document.getElementById('div1');
    odiv.onclick = function(){
      alert('Hello');
          }
    }

一个没有函数名的函数就是匿名函数

函数传参

<script type = "text/javascript">
    widow.onload = function (){
          var a = document.getElementById('div1');
          function changeStyle(sty1,va1){
                a.style[sty1]  = va1;
          }
                changeStyle('color', 'red');
                changeStyle('background','gold');
      }
</script>

return关键字

window.onload = function (){
         input01 = document.getElementById('input01');
          input02 = document.getElementById('input02');
          btn =  document.getElementById('btn');
          btn.onclick = function(){
              var val01 = input01.value;
              var valo2 = input02.value;
              var result = add(val01,val02);
              alert(result)
              };
              funtion add(a,b){
                   var c = parseInt(a) + parseInt(b);
                    return c;
                }
        }

1.return返回一个值

2.也可以用于结束语句