list变String[],js sleep

1.list变字符数组String[] s =  list.toArray(new String[list.size()])

2. map迭代，变set迭代  

  Set set = map.keySet() ； 

  Iterator iterator  = set.iterator();

while(iterator.hasNext()){

row.createCell(n).setCellValue((String)iterator.next());

n++;

}

3. 替换与截取

String s = "[x,y,x]";

String ss =s.replaceAll("\\[|\\]" , "");

ss = s.substring(1,s.length()-1);

System.out.println(ss);

String field = "title"+ ".raw";

ss = field.substring(0, field.length()-4);

System.out.println(ss);

4.js中没有自带的sleep方法，要想休眠要自己定义个方法

function sleep(numberMillis) {    
var now = new Date();    
var exitTime = now.getTime() + numberMillis;   
while (true) { 
now = new Date();       
if (now.getTime() > exitTime) 
return;    
} 
}