<div class="form-group">

    <label class="col-sm-3 control-label no-padding-right" for="form-field-5"> 內(nèi)容</label>

    <div class="col-sm-9">

        <textarea class="col-sm-8" id="form-field-5" placeholder="請輸入內(nèi)容..."></textarea>

    </div>

</div>

復(fù)制代碼代碼如下:

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) {

                //每行減掉固定行高

                $(this).height($(this).height() - lineHeight);

            } else if (currentEnterCount > enterCount) {

                //每行加入固定行高

                $(this).height($(this).height() + lineHeight);

                $(this).attr("enterCount", currentEnterCount);

            }

            //記錄當(dāng)前行高

            $(this).attr("enterCount", currentEnterCount);

        });

    }

});

//調(diào)用自動(dòng)高度

$.textareaAutosize_dc();