单项选择题
A.function,numberB.undefined,undefinedC.undefined,2D.以上都不对
var y = 18,rs="";if(y%4==0 || y%6!=0){ rs="yes";}else{ ...
单项选择题var y = 18,rs="";if(y%4==0 || y%6!=0){ rs="yes";}else{ rs="no";}console.log(rs);打印结果是()
A.yesB.noC.undefinedD.null
var Bbc = function(){ this.num = 1 } Bbc.prototype['exa...
单项选择题var Bbc = function(){ this.num = 1 } Bbc.prototype['exam'] = function(){ this.num++; } var bbc = new Bbc(); console.log(bbc.exam())结果是? ()
A.1B.2C.undefinedD.以上都不对
var name = 'hello world'; name.substr(2,4)的结果是()A."l"B....
单项选择题var name = 'hello world'; name.substr(2,4)的结果是()
A."l"B."ll"C."llo"D."llo "