js选中指定dom文本

 1function selectAll(id) {
 2  var h = document,
 3    i = h.getElementById(id),
 4    d,
 5    g;
 6  if (h.body.createTextRange) {
 7    d = document.body.createTextRange();
 8    d.moveToElementText(i);
 9    d.select();
10  } else {
11    if (window.getSelection) {
12      g = window.getSelection();
13      d = document.createRange();
14      d.selectNodeContents(i);
15      g.removeAllRanges();
16      g.addRange(d);
17    }
18  }
19}