JavaScript 演練(6). 函數的定義與自執行

/* 函數的定義 */function a() { return 1; }var b = function () { return 1; };var c = function d() { return 1; }; // d === undefinedvar e = new Function("return 1;");alert(typeof a); //functionalert(typeof b); //functionalert(typeof c); //functionalert(typeof d); //undefinedalert(typeof e); //functionalert(a() + b() + c() + e()); //4/* 函數自執行 */(function (a, b) { alert(a + b); }) (1, 2);        //3(function (a, b) { alert(a + b); } (1, 2));        //3var f = function (a, b) { alert(a + b); } (1, 2);  //3; f === undefined