={
add:function(n1,n2){ return n1+n2;
},
sub:function(n1,n2){ return n1-n2;
}
}
console.log...,n2){ return n1+n2;
},//合法的属性名可以不加引号 sub:function(n1,n2){ return n1-n2;
}, "@":function(){...(n1,n2){ return n1+n2;
},//合法的属性名可以不加引号 sub:function(n1,n2){ return n1-n2;
}, "@":function(word...,n2){ return n1+n2;
},//合法的属性名可以不加引号 sub:function(n1,n2){ return n1-n2;
}, "@":function(word)...对象中要使用链式调用,则方法中需要返回当前对象
var operation={
add:function(n1,n2){
console.log(n1+n2); return this