JS选择指定的文字

最新推荐文章于 2024-07-10 10:39:28 发布

转载最新推荐文章于 2024-07-10 10:39:28 发布 · 577 阅读

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#function

JS选择指定的文字，例如微博的话题.

 function myField()
 {
  var marker = "#";
  var v = "在这里输入你想要说的话题";
  var s1 =  marker + v + marker;
  var myField = T$('wordstextarea');
  var s2 = myField.value;
  myField.focus();
  if (window.getSelection)
  {    
   var pos1 = s2.indexOf(s1);
     if (pos1 == -1)
  {
     myField.value += s1;
     pos1 = s2.length + 1;
     } 
     else
  {
      pos1 += 1;
     }
  myField.selectionStart = pos1;
  myField.selectionEnd = pos1 + s1.length - 2;
  } 
  else 
  {
  var  range=myField.createTextRange();
    if (!range.findText(s1)){
     myField.value += s1;
     range.findText(s1);
  }
     range.findText(v);
  range.select(); 
  }
}