function list1(){}
function list2(){
    document.writeln("<p align='center'>");
    
    document.writeln("</p>");
}
function list3(){
    document.writeln("<p align='center'>");
    
    document.writeln("</p>");
}

function yuedu1(){}
function yuedu2(){
    document.writeln("<div style='margin:10px auto;width: 930px;height: 250px;'>");
    document.writeln("<span style='float:left;margin:0 5px'>");
    
    document.writeln("</span>");
    document.writeln("<span style='float:left;margin:0 5px'>");
    
    document.writeln("</span>");
    document.writeln("<span style='float:left;margin:0 5px'>");
    
    document.writeln("</span>");
    document.writeln("</div>");
}
function yuedu3(){
    
// 
}
function yuedu4(){
    document.writeln("<p align='center'>");
    
    document.writeln("</p>");
}