单项选择题
A.40
B.20
C.10
D.15
单项选择题 for(var i=0;i<=4;i+=2){ console.log(i); }打印结果是()
单项选择题 for(var i=1;i<=12;i+=3){ console.log(i); }打印结果是()
单项选择题 var userName, type = ""; if (typeof(userName) === "undefined") { type = "boolean"; } else if (typeof(userName) === "string" || typeof(userName) === "number") { type = "string" } else { type = "object" } console.log(type); 打印结果是()