以字符串的形式返回获取的网页的内容（只读）。
如果对象尚未下载完数据，则返回一个空字符串。
使用 isDone 或 yield 查看数据是否可用。
该函数适用于 UTF-8 或 ASCII 字符集的网页内容。对于其他字符或二进制数据，
返回的字符串可能不正确。在这些情况下，请使用 bytes 属性
获取原始字节数组。
另请参阅：bytes 属性。
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