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callback function in js

巴扎黑
巴扎黑Original
2016-12-06 10:34:091047browse

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
<html> 
<head> 
  <base href="<%=basePath%>"/> 
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 
<title>回调函数</title> 
<script type="text/javascript" src="js/jquery-1.7.1.min.js"></script> 
<script type="text/javascript"> 
//返回值是一个函数格式 
function a(callBackFunction){ 
console.log("这是parsent函数a"); 
var m=1; 
var n=3; 
return callBackFunction(m,n); 
} 
function b(m,n){ 
console.log("这是回调函数b"); 
return m+n; 
} 
$(function(){ 
   var result=a(b); 
  //输出结果是：4 
   console.log("result="+result); 
   var c=function(){ 
return 3*4; 
  }; 
   console.log("输出的结果是："+c()); 
}); 
</script> 
</head> 
<body> 
</body> 
</html>


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