pragma solidity ^0.4.0;
contract Test{
/* 属性的访问权限
priveta public internal
defualt internal
interlnal,private cannot be accessed from outside
*/
uint8 internal _money;
uint8 _age;
uint8 private _height;
uint8 public _sex;
/*uint8 public _sex == function _sex() returns(uint8)
当属性类型为public时,会生成一个和属性名相同并且返回值就是当前属性的get函数
function _sex()函数会覆盖掉public类型的属性自动生成的get函数;_sex()返回的是1,而不是0
*/
function _sex() returns(uint8){
//return _sex;
//this._age; return this.age();TypeError: Member "age" not found or not visible after argument-dependent lookup in contract Test
this._sex();
return 1;
}
/*方法的访问权限
//public private internal external
//defualt public
//internal private cannot be accessed from outside
*/
function sex() returns(uint8){
return 1;
}
function age() internal returns(uint8){
return 18;
}
function height() public returns(uint8){
return 175;
}
function money() private returns(uint){
return 3500;
}
function year() external returns(uint){
return 2018;
}
function testInternal() returns(uint){
//return this.sex();
//return this.year(); this(指针) 通过合约地址进行访问
return money();
//return this.age();TypeError: Member "age" not found or not visible after argument-dependent lookup in contract Person
//
}
}无论是属性还是方法,只有是public/external类型时,才可以通过合约地址进行访问,合约内部的this就是当前合约地址。
在合约内部如果要访问internal,private类型的属性或者是函数,直接访问即可,不要试图通过this去访问
//本合约内部调用
//this.external调用
function test() public{
getC(); //interl
this.getD();//external
getE();//private
this.kill();//public
kill();//public
}
//未使用继承,外部调用
//只能调用external/public
contract mytract{
function getA() public {
**getC(); //interl
this.getD();//external
**getE();//private
this.kill();//public
**kill();//public
}
}
//使用继承,外部调用
//无法调用私有变量
contract mytract is Funder{
function getA() public {
getC(); //interl
this.getD();//external
**getE();//private
this.kill();//public
kill();//public
}
}