因为要删除整个元素，这是更好地使contenteditable="false"，使浏览器不会让一元素的内容被删除。
然后你就可以按如下方式使用该属性在事件处理测试：在最新的Chrome版本
$('#editable').on('keydown', function (event) {
if (window.getSelection && event.which == 8) { // backspace
// fix backspace bug in FF
// https://bugzilla.mozilla.org/show_bug.cgi?id=685445
var selection = window.getSelection();
if (!selection.isCollapsed || !selection.rangeCount) {
return;
}
var curRange = selection.getRangeAt(selection.rangeCount - 1);
if (curRange.commonAncestorContainer.nodeType == 3 && curRange.startOffset > 0) {
// we are in child selection. The characters of the text node is being deleted
return;
}
var range = document.createRange();
if (selection.anchorNode != this) {
// selection is in character mode. expand it to the whole editable field
range.selectNodeContents(this);
range.setEndBefore(selection.anchorNode);
} else if (selection.anchorOffset > 0) {
range.setEnd(this, selection.anchorOffset);
} else {
// reached the beginning of editable field
return;
}
range.setStart(this, range.endOffset - 1);
var previousNode = range.cloneContents().lastChild;
if (previousNode && previousNode.contentEditable == 'false') {
// this is some rich content, e.g. smile. We should help the user to delete it
range.deleteContents();
event.preventDefault();
}
}
});