<div class="form-group">     <label class="col-sm-3 control-label no-padding-right" for="form-field-5"> 内容</label>     <div class="col-sm-9">         <textarea class="col-sm-8" id="form-field-5" placeholder="请输入内容..."></textarea>     </div> </div>

jQuery.extend({     textareaAutosize_dc: function() {         $("textarea").on("keyup", function(e) {             var currentEnterCount = $(this).val().split("\n").length;             var lineHeight = Number($(this).css("line-height").replace("px", ""));             var enterCount = $(this).attr("enterCount");             if (currentEnterCount < enterCount && enterCount != undefined) {                 //每行减掉固定行高                 $(this).height($(this).height() - lineHeight);             } else if (currentEnterCount > enterCount) {                 //每行加入固定行高                 $(this).height($(this).height() + lineHeight);                 $(this).attr("enterCount", currentEnterCount);             }             //记录当前行高             $(this).attr("enterCount", currentEnterCount);         });     } }); //调用自动高度 $.textareaAutosize_dc();