38-对象,数据类型转换:数字➡️⬅️字符串parseInt(),parseFloat取浮点,Number(),isNaN(),toString和String,.split(符号),布尔和运算符号
1.对象一系列的属性和属性值的集合;键值对,键名键值选择器{属性:属性值;属性:属性值;}varobj1={"ming":"小明","age":"22","sex":"男"}varobj2={"ming":"小李","age":"22","sex":"男"}varobj3={"ming":"小刘","age":"22","sex":"nv"}vararr=[obj1,obj2,obj3];cons