1 // 题目1：如下代码输出什么?
 2 if ("hello") {
 3     console.log("hello")
 4 } //true
 5 
 6 // 题目2：如下代码输出什么?
 7 if ("") {
 8     console.log(‘empty‘)
 9 }//false
10 
11 // 题目3：如下代码输出什么?
12 if (" ") {
13     console.log(‘blank‘)
14 }//true
15 // 题目4：如下代码输出什么?
16 if ([0]) {
17     console.log(‘array‘)
18 }//true
19 
20 if(‘0.00‘){
21   console.log(‘0.00‘)
22 }//true
23 
24 if(+0.00){
25    console.log(‘haha‘)
26 }//false +转换为数字
27 
28 if（[]）{
29    console.log(‘haha‘)
30 }//turn

 1 "" == 0  //题目1
 2 " " == 0  //题目2
 3 "" == true  //题目3
 4 "" == false  //题目4
 5 " " == true  //题目5!
 6 " " == true  //题目6
 7 !" " == false  //题目7
 8 "hello" == true  //题目8
 9 "hello" == false //题目9
10 "0" == true  //题目10
11 "0" == false  //题目11
12 "00" == false  //题目12
13 "0.00" == false  //题目13
14 undefined == null  //题目14
15 true == true  //题目15
16 [] == true  //题目16
17 var obj = { 
18   a: 0, 
19   valueOf: function(){return 1} 
20 } 
21 obj == "[object Object]"  //题目17
22 obj == 1  //题目18
23 obj == true  //题目19