<h3>

  演示

</h3>

<p id="demo"></p>

var man,i,x="";

man={

  "name":"tom",

  "age" : 35,

  "children" :{

    "boy":"bob",

    "gril":"lucy",

    "grils":"mary"

  }

}

delete man.children.boy;

for(i in man.children){

  x+=man.children[i]+"<br>";

}

document.getElementById("demo").innerHTML=x;