单项选择题
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 "
[3,7,8,0].map(function (v,i) {return v%3;})该运算的输出是? ()A...
[3,7,8,0].map(function (v,i) {return v%3;})该运算的输出是? ()
A.[1,2,3,0]B.[0,1,2,0]C.[true,true,false,true]D.[2,6,0]