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Textarea根据内容自适应高度

直接看代码吧，很简单，也很实用 。

复制代码 代码如下:

<!DOCTYPE html>
<html>
<head>
<title>autoresizing textarea</title>
<style type="text/css">
textarea {
    border: 0 none white;
    overflow: hidden;
    padding: 0;
    outline: none;
    background-color: #D0D0D0;
    resize: none;
}
</style>
<script type="text/javascript">
var observe;
if (window.attachEvent) {
    observe = function (element, event, handler) {
        element.attachEvent(on+event, handler);
    };
}
else {
    observe = function (element, event, handler) {
        element.addEventListener(event, handler, false);
    };
}
function init () {
    var text = document.getElementById(text);
    function resize () {
        text.style.height = auto;
        text.style.height = text.scrollHeight+px;
    }
    /* 0-timeout to get the already changed text */
    function delayedResize () {
        window.setTimeout(resize, 0);
    }
    observe(text, change,  resize);
    observe(text, cut,     delayedResize);
    observe(text, paste,   delayedResize);
    observe(text, drop,    delayedResize);
    observe(text, keydown, delayedResize);

    text.focus();
    text.select();
    resize();
}
</script>
</head>
<body onload="init();">
<textarea cols="40" rows="1" style="height:25px;" id="text"></textarea>
</body>
</html>