判断变量类型 typeof 1 //"number" typeof '1' //"string" typeof {} //"object" typeof true //"boolean" typeof undefined // "undefined" typeof null //"object" #bug typeof Symbol //"function" typeof Symbol(1) //"symbol"...
判断变量类型 typeof 1 //"number" typeof '1' //"string" typeof {} //"object" typeof true //"boolean" typeof undefined // "undefined" typeof null //"object" #bug typeof Symbol //"function" typeof Symbol(1) //"symbol"...
