字符串

• 字符串的定义
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• 字符串常用操作
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2.字符串的方法

• 判断类型
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• 查找和替换
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• 大小写转换和文本对齐
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• 去除空白字符和拆分连接
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3.字符串判断

• <font color=#FF0000 >注意：判断数字不能判断小数！</font>
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4.字符串的查找

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5.文本对齐
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6.字符串去除空白字符
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7.字符拆分和连接
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8.*字符串的切片
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