$(function() {
 /* 在textarea处插入文本--Start */
 (function($) {
 $.fn.extend({
   insertContent : function(myValue, t) {
   var $t = $(this)[0];
   if (document.selection) { // ie
    this.focus();
    var sel = document.selection.createRange();
    sel.text = myValue;
    this.focus();
    sel.moveStart('character', -l);
    var wee = sel.text.length;
    if (arguments.length == 2) {
    var l = $t.value.length;
    sel.moveEnd("character", wee + t);
    t <= 0 ? sel.moveStart("character", wee - 2 * t - myValue.length) : sel.moveStart( "character", wee - t - myValue.length);
    sel.select();
    }
   } else if ($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;
    if (arguments.length == 2) {
    $t.setSelectionRange(startPos - t,
     $t.selectionEnd + t);
    this.focus();
    }
   } else {
    this.value += myValue;
    this.focus();
   }
   }
  })
 })(jQuery);
