convert.js

jsp设计的留言板,供大家参考,使用的是文本文件作为数据库

function convert(str)
{
  var newstr = "";
  for(i=0;i<str.length;i++)
	{ 
	  var ch =str.charAt(i);  
	  switch(ch)
	  {
	    case String.fromCharCode(13) : newstr=newstr+"<br>"; break;
	    case String.fromCharCode(32) : newstr=newstr+"&nbsp"; break;
	    case "<" : newstr=newstr+"&lt"; break;
	    case ">" : newstr=newstr+"&gt"; break;
	    case String.fromCharCode(34) : newstr=newstr+"&quot"; break;
	    case "'" : newstr=newstr+"''"; break;
	    case "&" : newstr=newstr+"&amp"; break;
	    default  : newstr+=ch;
	  }
	}
  return newstr;
 }
 //---------revers convert
 function reconvert(str)
 {
    var newstr = "";
    newstr = str.replace("<br>",String.fromCharCode(13));
    newstr = str.replace("&nbsp"," ");
    newstr = str.replace("&lt","<");
    newstr = str.replace("&gt",">");
    newstr = str.replace("&quot",String.fromCharCode(34));
    newstr = str.replace("''","'");
    newstr = str.replace("&amp","&");
    return newstr;
 }
 //---------check space
 function isSpace(str)
 {
    for(i=0;i<str.length;i++)
    {
      if(str.charAt(i) != " ")return false;
    }
    return true;
 }