求助一个问题，为什么功能实现不了 - JavaScript论坛

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求助一个问题，为什么功能实现不了

<html>
<head>
<title>无标题文档</title>
<style type="text/css">
</style>
<script type="text/javascript">
function showLength() {
var texts = document.form1.strings.value.length;
document.form2.lengths.value = texts;
}

function htm_fontcolor() {
var texts = document.form1.strings.value;
texts = texts.fontcolor("blue");
document.form2.lengths.value = texts;
}

function htm_big() {
var texts = document.form1.strings.value;
texts = text.big();
document.form2.lengths.value = texts;
}

function bigToSmall() {
var texts = document.form1.strings.value;
texts = texts.toLowerCase();
document.form2.lengths.value = texts;
}

function htm_bold() {
var texts = document.form1.strings.value;
texts = texts.bold();
document.form2.lengths.value = texts;
}

</script>
</head>

<body>
<center>
<form name="form1">
请输入内容：<br/>
<textarea name="strings" rows="5" cols="30"></textarea>
</form>
<form name="form2">
<input type="button" value="显示字符串长度" onClick="showLength()"><br/>
<input type="button" value="<big>标记" onClick="htm_big()"><br/>
<input type="button" value="全部转换为小写" onClick="bigToSmall()"><br/>
<input type="text" name="lengths" size="40"><p>
<input type="button" value="粗体显示" onClick="htm_bold()">
<input type="button" value="显示为蓝色字体" onClick="htm_fontcolor()">
</form>
</center>

</body>
</html>

为什么大写转小写功能可以实现，粗体显示和显示为蓝色字体功能实现不了呢，谢谢各位

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<html> <head> <title>无标题文档</title> <script type="text/javascript"> function showLength() { var texts = document.form1.strings.value.length; document.getElementById("lblResult").innerHTML = texts; } function htm_fontcolor() { var texts = document.form1.strings.value; texts = texts.fontcolor("blue"); document.getElementById("lblResult").innerHTML = texts; } function htm_big() { var texts = document.form1.strings.value; texts = "<big>" + texts + "</big>"; document.getElementById("lblResult").innerHTML = texts; alert(document.getElementById("lblResult").innerHTML) } function bigToSmall() { var texts = document.form1.strings.value; texts = texts.toLowerCase(); document.getElementById("lblResult").innerHTML = texts; } function htm_bold() { var texts = document.form1.strings.value; texts = texts.bold(); document.getElementById("lblResult").innerHTML = texts; } </script> </head> <body> <center> <form name="form1"> 请输入内容：<br/><textarea name="strings" rows="5" cols="30"></textarea> </form> <form name="form2"> <input type="button" value="显示字符串长度" onClick="showLength()"><br/> <input type="button" value="<big>标记" onClick="htm_big()"><br/> <input type="button" value="全部转换为小写" onClick="bigToSmall()"><br/> <span id="lblResult"></span><br> <input type="button" value="粗体显示" onClick="htm_bold()"> <input type="button" value="显示为蓝色字体" onClick="htm_fontcolor()"> </form> </center> </body> </html>