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<h1>
        JavaScript自定义函数实现字符串反转 - Reverse</h1>
    输入：<br />
    <textarea name="txt_Input" rows="2" cols="20" id="txt_Input" style="height:100px;width:99%;">123456789</textarea>
    <br />
    <br />
    <input type="button" id="btn_OK" value="确定" onclick="OkClick()" />
    <br />
    <br />
    输出：<br />
    <textarea name="txt_Output" rows="2" cols="20" id="txt_Output" style="height:100px;width:99%;"></textarea>
</body>
</html>

function StrReverse(str) { 
        // 字符串反转 - Reverse //
        if (str == null)
            return "";

var theResult = "";
        var theLen = str.length;

for (var i = theLen - 1; i >= 0; --i) {
            theResult = theResult + str.substr(i, 1);
        }
        return theResult;
    }

function OkClick() {
        var inputCtrl = document.getElementById("txt_Input");
        var outputCtrl = document.getElementById("txt_Output");

var theValue = inputCtrl.value;
        theValue = StrReverse(theValue);

outputCtrl.value = theValue;
    }

</script>

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