JavaScript自定义函数leftTrim过滤左边空格

2017-01-29 20:52:51 访问(1762) 赞(0) 踩(0)

<!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 id="Head1"><title>

</title></head>
<body>

    <h1>
        JavaScript自定义函数leftTrim过滤左边空格</h1>
    输入：<br />
    <textarea name="txt_Input" rows="2" cols="20" id="txt_Input" style="height:100px;width:99%;">

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</textarea>
    <br />
    <br />
    <input type="button" id="btn_OK" value="trim过滤空格" 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>

<script language="javascript" type="text/javascript">

    function StrLeftTrim(str) { 
        // 左边Trim空格 //
        if (str == null)
            return "";

        return str.replace(/(\s*)(.*)/g, "$2");
    }

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

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

        outputCtrl.value = theValue;
    }
 

</script>