【文件属性】：
文件名称：每天一篇javascript学习小结（基础知识）
文件大小：58KB
文件格式：PDF
更新时间：2021-01-21 11:19:05
AS asc c
1、字符转换
var s1 = 01;
var s2 = 1.1;
var s3 = z;//字母'z'无法转换为数字，所以或返回NaN
var b = false;
var f = 1.1;
var o = {
valueOf: function() {
return -1;
}
};
s1 = -s1; //value becomes numeric -1
s2 = -s2; //value becomes numeric -1.1
s3 = -s3; //value becomes NaN
b = -b; /