// method 1
var pa1 = function () {
console.log('爬一楼');
return {
success: (fun) => {fun();}
}
};
var pa2 = function () {
console.log('爬二楼');
return {success: (fun) => {fun();}}
};
var pa3 = function () {
console.log('爬三楼');
return {
success: function () {
}
}
};
pa1().success(function () {
pa2().success(function () {
pa3();
});
})
// method 2