textarea 标签 设置最长字数和显示剩余字数

html：

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<textarea id="Remark" class="form-control" maxlength="150" oninput="TextareaFontLength('Remark')"  onchange="this.value = this.value.substring(0, 150);TextareaFontLength('Remark')" onkeydown="this.value = this.value.substring(0, 150);TextareaFontLength('Remark')" onkeyup="this.value = this.value.substring(0, 150);TextareaFontLength('Remark')"style="height:100px;"></textarea>              <div style="text-align:right">                  <span id="span_Font_Length" style="font-size: 14px;">0</span>                  <span style="font-size: 14px;">/</span>                  <span style="font-size: 14px;">150</span>              </div>

js：

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<script type="text/javascript">           //TextArea 实时显示字数        function TextareaFontLength(id) {            var strTeatArea = $("[id$='" + id + "']").val().length;            $("[id$='span_Font_Length']").text(strTeatArea);        }      </script>