【JS技巧】JavaScript技巧介绍1 -- switch

来源：互联网发布：程序员有转行的吗编辑：程序博客网时间：2024/05/17 13:12

switch

1 switch条件为数字时，可以使用数组map

var fun0 = function(){console.log('fun0');}var fun1 = function(){console.log('fun1');}var fun2 = function(){console.log('fun2');}var condition = 1;switch(condition){case 0:fun0();break;case 1:fun1();break;case 2:fun2();break;}

等同于

var fun0 = function(){console.log('fun0');}var fun1 = function(){console.log('fun1');}var fun2 = function(){console.log('fun2');}var condition = 1;var condition_arr_map = [fun0, fun1, fun2];condition_arr_map[condition]();

2 当switch条件为字符串时，可以使用object的key和value来做map

var fun0 = function(){console.log('fun0');}var fun1 = function(){console.log('fun1');}var fun2 = function(){console.log('fun2');}var fruit_kind = 'grape';switch(fruit_kind){case 'apple':fun0();break;case 'banana':fun1();break;case 'grape':fun2();break;}

等同于

var fun0 = function(){console.log('fun0');}var fun1 = function(){console.log('fun1');}var fun2 = function(){console.log('fun2');}var fruit_kind = 'grape';var condition_obj_map = {'apple': fun0,'banana': fun1,'grape': fun2}condition_obj_map[fruit_kind]();

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