其实是一种利用符号进行的类型转换,转换成数字类型
~~true == 1
~~false == 0
~~"" == 0
~~[] == 0
~~undefined ==0
~~!undefined == 1
~~null == 0
~~!null == 1
###取整数,省略小数部分,并且不进行四舍五入!
其实是一种利用符号进行的类型转换,转换成数字类型
~~true == 1
~~false == 0
~~"" == 0
~~[] == 0
~~undefined ==0
~~!undefined == 1
~~null == 0
~~!null == 1
###取整数,省略小数部分,并且不进行四舍五入!