js callback simple code example

This article mainly shares a simple code with you, which is a simple code example for js callback. I hope this code can help everyone.

function test(callback) {
   var data = "aaa";
  typeof callback == 'function' && callback(data)
    }



test(function (data) {

  console.log(data);

 });

typeof  callback   输出callback的类型
== 'function'        
等于function(函数)&& callback(data)         
&&前面的为真,则执行&&后面的语句 callback(data),  data为需要传递的函数参数，

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