1.转换为大写字符
.toUpperCase()
2.字符串反转
this
.message =
this
.message.split(
''
).reverse().
join
(
''
)
3.从index开始截取字符串
value.slice(index)
4.按index取字符串
value.charAt(0)
1.转换为大写字符
.toUpperCase()
2.字符串反转
this
.message =
this
.message.split(
''
).reverse().
join
(
''
)
3.从index开始截取字符串
value.slice(index)
4.按index取字符串
value.charAt(0)