转自:http://blog.csdn.net/lbsljn/archive/2009/12/29/5099590.aspx MinGw + CodeBlock + QT4.5 类定义后面要加";" 函数的实现部分,如果定义部分有void,则实现部分不能少; 检查include文件有无少; error: request for member `show' in `((MainWindow*)this)->MainWindow::rightform', which is of no
换行的字符串 "This string\nhas two lines" 字符串中使用单引号时应该怎么写 'You\'re right, it can\'t be a quote' 把数字变成字符串并保留两位小数 var n = 123456.789 n.toFixed(0); //"123457" n.toFixed(2); //"123456.79" parseFloat(str)str以非数字开头,则返回NaN parseFloat(str)