10.其他
1.选择题
var name = 'World!';
(function () {
if (typeof name === 'undefined') {
var name = 'Nodeing';
console.log('Goodbye ' + name);
} else {
console.log('Hello ' + name);
}
})();
// 输出结果
A: Goodbye Nodeing
B: Hello Nodeing
C: Hello undefined
D: Hello World
2.选择题
["1", "2", "3"].map(parseInt)
//输出结果
A:["1", "2", "3"]
B:[1, 2, 3]
C:[0, 1, 2]
D:other
3.选择题
var val = 'nodeing';
console.log('Value is ' + (val === 'noding') ? 'Something' : 'Nothing');
// 输出结果
A: Value is Something
B: Value is Nothing
C: NaN
D: other
4.选择题
function showCase(value) {
switch(value) {
case 'A':
console.log('Case A');
break;
case 'B':
console.log('Case B');
break;
case undefined:
console.log('undefined');
break;
default:
console.log('Do not know!');
}
}
showCase(new String('A'));
// 选项
A: Case A
B: Case B
C: Do not know!
D: undefined
5.选择题
function showCase2(value) {
switch(value) {
case 'A':
console.log('Case A');
break;
case 'B':
console.log('Case B');
break;
case undefined:
console.log('undefined');
break;
default:
console.log('Do not know!');
}
}
showCase(String('A'));
A: Case A
B: Case B
C: Do not know!
D: undefined
6.选择题
var a = [0];
if ([0]) {
console.log(a == true);
} else {
console.log("wut");
}
// 选项
A: true
B: false
C: "wut"
D: other
7.选择题
(function(){
var x = y = 1;
})();
console.log(y);
console.log(x);
// 选项
A: 1, 1
B: error, error
C: 1, error
D: other
8.选择题
var a = /123/,
b = /123/;
a == b
a === b
A: true, true
B: true, false
C: false, false
D: other
9.选择题
var END = Math.pow(2, 53);
var START = END - 100;
var count = 0;
for (var i = START; i <= END; i++) {
count++;
}
console.log(count);
A: 0
B: 100
C: 101
D: other
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