lizhenqiu blog

<script language="javascript">
var r= "1\n2\n3\n";
//将字母\n替换成分号
alert(r.replace("\n",";"));

结果：1;2\n3\n 只替换了第一个
</script>

<script language="javascript">
var r= "1\n2\n3\n";
//将字母\n替换成分号
alert(r.replace(/\n/g, ";"));

结果：1;2;3; replace 的第一个参数可以是正则表达式，/g标识全文匹配。
</script>

	$(document).ready(function(){
  $(".runcodenow").click(function(){
		var index = $(".runcodenow").index(this);
		var element=$('code').eq(index);
		var runcode=$(element).html();
		

		runCodenew(runcode);
  });
});
function runCodenew(runcode) {
	var winname = window.open('', "_blank", '');
	var obj = runcode;
	//alert(obj);
	//obj = obj.replace(/ /g,' ');
	obj=htmlencode(obj);
	
	obj=htmlspecialchars_decode(obj);
	winname.document.open('text/html', 'replace');
	winname.opener = null // 防止代码对论谈页面修改
	winname.document.write(obj);
	winname.document.close();
}
function htmlencode(s){  
    var div = document.createElement('div');  
    div.appendChild(document.createTextNode(s));  
    return div.innerHTML;  
}  
function htmldecode(s){  
    var div = document.createElement('div');  
    div.innerHTML = s;  
    return div.innerText || div.textContent;  
}  
    function htmlspecialchars_decode(str){    
			  

	
              str = str.replace(/&/g, '&'); 
              str = str.replace(/&lt;/g, '<');
              str = str.replace(/&gt;/g, '>');
				str = str.replace(/&nbsp;/g, ' ');
              str = str.replace(/&quot;/g, "''");  
              str = str.replace(/&#039;/g, "'");  
				str = str.replace(/<br>/g, ' ');
				str = str.replace(/<br \/>/g, ' ');
              return str;  
    }