javascript初级的一些小代码

function myFunc(){document.write("hello word")document.write("<h1>This is a header</h1>")document.write("<p>This is a paragraph</p>");document.write("<p>This is another paragraph</p>");   var x = 2;    var y = 3;    var z = x+y;    document.write(z)    document.write("<p>")    z==5? document.write("z==5"):document.write("z!=5")    document.write("</p>")            document.write("<p>")    var d=new Date()    var time=d.getHours()    if (time<10)     {    document.write("<b>Good morning</b>")    }else{        document.write("<b>Good afternoon</b>")    }    document.write("</p>")            var d = new Date();    theDay = d.getDay();    switch(theDay){    case 3:    document.write("W星期三")    break;    case 4:    document.write("thursday")    break;    default:    doucument.write("you Gusses!")    }    /**     * 弹出框    document.write("<p>")    if(confirm("这是确定提示么")){    alert("sure")    }else{    alert("not")    }    document.write("</p>")       alert( prompt("输入值","默认为1"));    */    document.write("</p>")            var x;    var mycars = new Array();    mycars[0]="Saab1"    mycars[1]="Saab2"    mycars[2]="Saab3"        for(x in mycars){  document.write(x)  document.write(mycars[x]+"<br/>")     }                 var a2 = new Array();    for(i=0;i<4;i++){    a2[i]= new Array(4);    for(j=0;j<4;j++){    a2[i][j]="["+i+","+j+"]";    document.write(a2[i][j]+"</br>")    }    }            document.write("</p>")    document.write(Math.round(4.7))    document.write("</p>")    document.write(Math.random())    document.write("</p>")    document.write(Math.floor(Math.random()*11))     document.write("</p>")                    }