下面的方法貌似没用数组,但实际上换汤不换药
用table自带的数组解决问题<html>
<head>
<script language="javascript">
function init(n){
var table = document.getElementById("abc");
for(var i = 0; i < n; i++){
var row = table.insertRow(-1);
for(var j = 0; j <= i; j++){
var cell = row.insertCell(-1);
if(j == 0 || j == i){
cell.innerHTML = 1;
}else if(i > 0){
var first = parseInt(table.rows[i - 1].cells[j - 1].innerHTML);
var second = table.rows[i - 1].cells[j] == null ? 0 : parseInt(table.rows[i - 1].cells[j].innerHTML);
cell.innerHTML = first + second;
}
}
}
}
</script></head><body onload="init(10)">
<table id="abc"></table>
</body>
</html>
用table自带的数组解决问题<html>
<head>
<script language="javascript">
function init(n){
var table = document.getElementById("abc");
for(var i = 0; i < n; i++){
var row = table.insertRow(-1);
for(var j = 0; j <= i; j++){
var cell = row.insertCell(-1);
if(j == 0 || j == i){
cell.innerHTML = 1;
}else if(i > 0){
var first = parseInt(table.rows[i - 1].cells[j - 1].innerHTML);
var second = table.rows[i - 1].cells[j] == null ? 0 : parseInt(table.rows[i - 1].cells[j].innerHTML);
cell.innerHTML = first + second;
}
}
}
}
</script></head><body onload="init(10)">
<table id="abc"></table>
</body>
</html>
<html>
<body>
<script type="text/javascript">
function triangle(col, row) {
if (row == 0 || col == row)
return 1;
else return triangle(col - 1, row - 1) + triangle(col - 1, row);
}function output(n) {
for (var i = 0; i <= n; i++) {
for (var j = 0; j <= i; j++)
document.write(" " + triangle(i, j));
document.write("<br />");
}
}
output(10);
</script>
</body>
</html>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>杨辉三角</title>
</head><body>
<style>
.d{float:left;width:50px;}
</style><div id=y3>杨辉三角<br></div>
<input type=button value="next" onclick=nextY3()>
<input type=button value="auto" onclick=autoY3()>
<input type=button value="reset" onclick=resetDiv()>
<script language="javascript">
<!--
var n=0
function nextY3(){
n++
createDiv("Y3_"+n,null,$("y3"))
for (var i=0;i<n;i++)var newobj=createDiv(null,"d",$("Y3_"+n))
$("Y3_"+n).innerHTML+="<br>"
for (var i=0;i<n;i++){
if (i==0)$$("Y3_"+n)[0].innerHTML=1
else if($("Y3_"+(n-1))){
var lastDiv=$$("Y3_"+(n-1))
$$("Y3_"+n)[i].innerHTML=parseInt(lastDiv[i-1].innerHTML)+parseInt((lastDiv[i])?lastDiv[i].innerHTML:0)
}
}
}function resetDiv(){
n=0;
$("y3").innerHTML=""
}
function autoY3(){
resetDiv()
var k=10
for(var i=0;i<k;i++)nextY3()
}
function createDiv(_id,_class,_parent){
var newDiv=document.createElement("div")
if (_id)newDiv.id=_id
if (_class)newDiv.className=_class
_parent.appendChild(newDiv)
}function $(id){return document.getElementById(id)}
function $$(id){return $(id).getElementsByTagName("div")}
//-->
</script>
</body></html>