document.write(\document.write(\串sb:\document.write(\
document.write(\的长度:\document.write(\
document.write(\设成7号字体:\document.write(\
document.write(\变红色:\document.write(\
document.write(\变大写:\document.write(\
document.write(\中首次出现字母l的下标位置=\document.write(\
document.write(\中末次出现字母l的下标位置=\document.write(\
document.write(\document.write(\
document.write(\document.write(\
document.write(\document.write(\
document.write(\document.write(\
document.write(\输出为上标:\document.write(\
document.write(\输出为sa的上标:\ document.write(\ document.close();