JavaScript设置窗口选择

window.selection.clear();

if (window.getSelection) {
   if (window.getSelection().empty) {  // Chrome
     window.getSelection().empty();
   } else if (window.getSelection().removeAllRanges) {  // Firefox
     window.getSelection().removeAllRanges();
   }
} else if (document.selection) {  // IE?
  document.selection.empty();
}

function clearSelection() {
    if (window.getSelection) {
        window.getSelection().removeAllRanges();
    } else if (document.selection) {
        document.selection.empty();
    }
}

Range

Selection

TextRange

function selectElement(element) {
    if (window.getSelection) {
        var sel = window.getSelection();
        sel.removeAllRanges();
        var range = document.createRange();
        range.selectNodeContents(element);
        sel.addRange(range);
    } else if (document.selection) {
        var textRange = document.body.createTextRange();
        textRange.moveToElementText(element);
        textRange.select();
    }
}