(function () { console.log('自执行函数1'); })();
(function () { console.log('自执行函数2'); }());
!function () { console.log('自执行函数3'); }();
+ function () {
    console.log('自执行函数4');
}();
- function () {
    console.log('自执行函数5');
}();
~function () {
    console.log('自执行函数6');
}();
!function () {
    console.log('自执行函数7');
}();
~~function () {
    console.log('自执行函数8');
}();
!!function () {
    console.log('自执行函数9');
}();