本文实例讲述了jquery实现在textarea指定位置插入字符或表情的方法。分享给大家供大家参考。具体实现方法如下：
1. 函数定义
复制代码 代码如下:
(function($){
    $.fn.extend({
        insertatcaret: function(myvalue){
            var $t=$(this)[0];
            if (document.selection) {
                this.focus();
                sel = document.selection.createrange();
                sel.text = myvalue;
                this.focus();
            }
            else
                if ($t.selectionstart || $t.selectionstart == '0') {
                    var startpos = $t.selectionstart;
                    var endpos = $t.selectionend;
                    var scrolltop = $t.scrolltop;
                    $t.value = $t.value.substring(0, startpos) + myvalue + $t.value.substring(endpos, $t.value.length);
                    this.focus();
                    $t.selectionstart = startpos + myvalue.length;
                    $t.selectionend = startpos + myvalue.length;
                    $t.scrolltop = scrolltop;
                }
                else {
                    this.value += myvalue;
                    this.focus();
                }
        }
    }) 
})(jquery);
2. 调用方法
复制代码 代码如下:
$(#textareaid).insertatcaret(新表情);
希望本文所述对大家的jquery程序设计有所帮助。