在运行以及写php程序中有时会出现这样的提示: PHP Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or th...
用正则表达式进行判断,代码: function isNum (str){ var pattern=/^\d+$/g; var result= String(str).match(pattern); if (result==null){ return false; }else{ return true; } } 运行结果:
List list =new ArrayList(); list.add('asdfffff'); list.add('sx'); list.add('kkj'); list.add('r'); System.out.println('原list:' + list); Iterator<String> iter = list.iterator();...