是否在HTML中选择范围结束？

document.addEventListener('mouseup', function() {
    var selection = window.getSelection();
    if (selection.toString().length > 0) {
        console.log('Selected text:', selection.toString());
    } else {
        console.log('No text selected');
    }
});

document.addEventListener('mouseup', function() {
    var selection = window.getSelection();
    if (selection.toString().length > 0) {
        // 执行某些操作
        console.log('Selected text:', selection.toString());
        // 例如，高亮显示选中的文本
        var range = selection.getRangeAt(0);
        var span = document.createElement('span');
        span.style.backgroundColor = 'yellow';
        range.surroundContents(span);
    }
});