2.10 布尔值和对象
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<meta charset="UTF-8">
<title>Title</title>
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<!--1、boolean:布尔值，只有false和true,在运算中false表示0，true表示1-->
<!--2、object:对象类型-->
var t1=4<7;
var b1=typeof t1;
document.write("类型：",b1,"，","4<7返回值为:",t1,"<br>")
var t2=false;
var b2=typeof t2;
document.write("类型：",b2,"，","false返回值为:",t2,"<br>")
var t3=false+true;
var b3=typeof t3;
document.write("类型：",b3,"，","false+true返回值为:",t3,"<br>")
var t4=10+true;
var b4=typeof t4;
document.write("类型：",b4,"，","10+true返回值为:",t4,"<br>")
var t5=[1,2,3,4];
var b5=typeof t5;
document.write("类型：",b5,"，","[1,2,3,4]返回值为:",t5,"<br>")
var t6={"name":"张三","age":"40"};
var b6=typeof t6;
document.write("类型：",b6,"，",'{"name":"张三","age":"40"}返回值为:',t6,"<br>")
</script>
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返回值：
类型：boolean，4<7返回值为:true
类型：boolean，false返回值为:false
类型：number，false+true返回值为:1
类型：number，10+true返回值为:11
类型：object，[1,2,3,4]返回值为:1,2,3,4
类型：object，{"name":"张三","age":"40"}返回值为:[object Object]