回调函数：
var TEST123={a:'aaa',b:'bbb',
show:function(){ console.log(TEST123.a);}
}
function writeCode(callback){//回调函数
console.log("start...")
callback();
console.log("end...")
}
function test(){
console.log('aa');
}
writeCode(test);
writeCode(TEST123.show);
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