怎么获取文本里的全部指定的文字啊?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<style type="text/css">
*{padding:0;margin:0;}
#loading{width:100px;margin:0 auto;}
#nav{width:735px;margin:0 auto}
#nav ul{list-style:none;}
#nav li{width:100px;height:100px;float:left;margin-left:5px; background:orange;}
#logo{width:300px;margin:66px auto;}
</style>

</head>
<body>
<h1 id="logo">
sadasdf23rwdsjf4dkrjjheksdjfgwkdj
</h1>
<script type="text/javascript">
var logo = document.getElementById("logo").lastChild.nodeValue;
var arr = new Array();
if(logo.indexOf("j") != -1){
arr.push(logo.indexOf("j"));
}
document.write(arr);
</script>
</body>
</html>

解决方案 »

  1.   


            <h1 id="logo">sadasdf23rwdsjf4dkrjjheksdjfgwkdj</h1>
            <script type="text/javascript">
                var logo = document.getElementById("logo").lastChild.nodeValue;
                for (var i = 0; i < logo.length; i++) {
                    if (logo[i] == 'j') {
                        document.write("\"j\" index=" + i+";");
                    }
                }
            </script>
    "j" index=13;"j" index=19;"j" index=20;"j" index=26;"j" index=32;
      

  2.   

    L@_@K
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title> new document </title>
        <meta http-equiv="content-type" content="text/html; charset=utf-8" />
        <meta name="generator" content="editplus" />
        <meta name="author" content="[email protected]" />
        <meta name="keywords" content="" />
        <meta name="description" content="" />
    </head><body>
        <h1 id="logo">
        sadasdf23rwdsjf4dkrjjheksdjfgwkdj
        </h1>
    <script type="text/javascript">
    var logo = document.getElementById("logo").lastChild.nodeValue;
    var logoChars = logo.split("");
    var arr = new Array();
    var len = logoChars.length;
    for (var i=0; i<len; i++)
    {
        if (logoChars[i]=="j")
            arr.push(i);
    }
    document.write(arr);
    </script>
    </body>
    </html>
      

  3.   

    直接用 charAt，不用分割为字符数组L@_@K
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title> new document </title>
        <meta http-equiv="content-type" content="text/html; charset=utf-8" />
        <meta name="generator" content="editplus" />
        <meta name="author" content="[email protected]" />
        <meta name="keywords" content="" />
        <meta name="description" content="" />
    </head><body>
        <h1 id="logo">
        sadasdf23rwdsjf4dkrjjheksdjfgwkdj
        </h1>
    <script type="text/javascript">
    var logo = document.getElementById("logo").lastChild.nodeValue;
    var arr = new Array();
    var len = logo.length;
    for (var i=0; i<len; i++)
    {
        if (logo.charAt(i)=="j")
            arr.push(i);
    }
    document.write(arr);
    </script>
    </body>
    </html>
      

  4.   

    sadasdf23rwdsjf4dkrjjheksdjfgwkdj
    你想得到什么？
    要获取全部英文"j",不要索引号？
      

  5.   

    textarea id="txt1" rows=10 cols=30 onmouseup="sel()">这是一行文字</textarea>
    <textarea id="txt2" rows=10 cols=30></textarea>
    <script language="javascript">
    var r;
    function sel()
    {
    r=document.selection.createRange();
    }
    function send()
    {
    if(r)
    {
    document.getElementById("txt2").value+=r.text;
    r=null;
    }
    }
    </script>
    <input type="button" value="传递" onclick="send()">
      

  6.   

    修改一下4楼的不就行了么？var logo = document.getElementById("logo").lastChild.nodeValue;
    var logoChars = logo.split("");
    var arr = new Array();
    var len = logoChars.length;
    for (var i=0; i<len; i++)
    {
        if (logoChars[i]=="j")
            arr.push(i);==》arr.push(logoChars[i]);
    }
    document.write(arr);
      

  7.   

     <h1 id="logo">
        sadasdf23rwdsjf4dkrjjheksdjfgwkdj
        </h1>
    <script type="text/javascript">
    var logo = document.getElementById("logo").innerHTML;
    var arr = logo.match(/j/ig);
    alert(arr.join(''));</script>
      

  8.   


    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
    <title>无标题文档</title>
        <style type="text/css">
                *{padding:0;margin:0;}
                #loading{width:100px;margin:0 auto;}
                #nav{width:735px;margin:0 auto}
                #nav ul{list-style:none;}
                #nav li{width:100px;height:100px;float:left;margin-left:5px; background:orange;}
                #logo{width:300px;margin:66px auto;}
        </style>
            
    </head>
    <body>
            <h1 id="logo">
                sadasdf23rwdsjf4dkrjjheksdjfgwkdj
            </h1>
            <script type="text/javascript">
                        var logo = document.getElementById("logo").lastChild.nodeValue;
    var reg = /j/g;
                        var arr = logo.match(reg);
                        document.write(arr);
            </script>
    </body>
    </html>