<script>
sum= 0;
for(i=1; i<101; i++)
{ sum= sum +i; }
document.write("１～１００までの合計 : " + sum + "<br>\n");
</script>
|
<script>
for(n=2; n<50; n++)
{ for(i=Math.floor(n/2); n%i!=0; i--);
if (i==1) document.write("素数 : " + n + "<br>\n");
}
</script>
|
<script>
k= 4;
l= Math.sqrt(2);
for(i=0; i<10; i++)
{ document.write("正" + k + "角形 ");
document.write("円周率 : " + l*k/2 + "<br>\n");
w= l/2;
lw= w*w;
h= Math.sqrt(1-lw);
hw= 1-h;
l= Math.sqrt(hw*hw+lw);
k= k+k;
}
</script>
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<script>
var str= " A, AA, AAA, AAAA, AA, aaa, BB, BBB, bbb, bbbb"
document.write(str + "<br>\n");
var ans= str.replace("AA", "A");
document.write(ans + "<br>\n");
var ans= str.replace(/B+/gi, "*" );
document.write(ans + "<br>\n");
</script>
|
<script>
var str= " A, BB, CCC, DDDD"
document.write(str + "<br>\n");
var ans= str.split(",").reverse().join("");
document.write(ans + "<br>\n");
</script>
|
<script>
function gcm(n, m)
{ var wn = parseInt(n); //値１
var wm = parseInt(m); //値２
while(wn!=wm)
{ if (wn>wm) wn -= wm;
else wm -= wn;
}
return wn;
}
d1 = prompt("DATA-1 を入力してください");
d2 = prompt("DATA-2 を入力してください");
document.write("GCM(" + d1 + ", " + d2 + ") は＝ " +gcm(d1,d2) + " です。<br>\n");
</script>
|
<script>
var items = ['りんご', 'みかん', 'メロン', 'いちご', 'すいか', 'なし', 'もも', 'バナナ'];
document.write("先頭:" + items[0] + " 後尾:" + items[items.length-1] + "<br>");
var result = items.pop();
document.write("ITEM(" + items + ") POP:" + result + "<br>");
result = items.shift();
document.write("ITEM(" + items + ") SHIFT:" + result + "<br>");
items.splice(1, 2);
document.write("ITEM(" + items + ")<br>");
items.splice(2);
document.write("ITEM(" + items + ")<br>");
</script>
|
<script>
num = new Array(56, 9, 789, 1234);
//Array の sort() メソッドを使う
num.sort();
document.write(num + "<br>");
//ソートの比較関数を定義する
num.sort(function(a,b){ return a-b; } );
window.alert("数値で比較 : " + num);
document.write(num + "<br>");
</script>
|
//ソートの比較関数を定義する
num.sort(function(a,b){ return a-b; } );
window.alert("数値で比較 : " + num);
document.write(num + "<br>");
</script>
|
<script>
function compareFunc(a, b)
{ return b - a;
}
function func(ary)
{ ary.sort(compareFunc);
}
var i;
ary= new Array();
for(i=0; i<10; i++)
{ var d = prompt("DATA を入力してください");
d = Number(d);
if (d==0) break;
ary[i]= d;
}
func(ary);
for(i=0; i<ary.length; i++)
{ document.write("ary[" + i + "] 番目は : " + ary[i] + " です。<br>\n");
}
</script>
|
<script>
var arr= [[1,2],[3,4,5],[6,7,8,9]];
var str= arr.join(',');
document.write(str + "<br>\n");
// 1,2,3,4,5,6,7,8,9
// 次元の区切り(/)を設定
str= "";
for(var i=0; i<arr.length; i++)
{ str= str + arr[i].join(',');
str= str + '/';
}
document.write(str + "<br>\n");
// 1,2/3,4,5/6,7,8,9/
// 二次元配列に戻す
var arrw= new Array();
var wk= str.split('/');
for(var i=0; i<wk.length; i++)
arrw.push(wk[i].split(','));
// 二次元配列を印字
for(var i=0; i<arrw.length; i++)
{ for(var j=0; j<arrw[i].length; j++)
document.write(arrw[i][j] + ",");
document.write("<br>\n");
}
</script>
|
<script>
var ary= new Array();
ary["ST"]= "Suzuki Tarou";
ary["TH"]= "Tanaka Hanako";
ary["YK"]= "Yamada Kouji";
ary["AK"]= "Ayase Keiko";
for(key in ary)
{ var name = ary[key];
document.write(key, ": ", name, "<br>\n");
}
</script>
|
<script>
function glcm(n, m)
{ var wn = parseInt(n); //値１
var wm = parseInt(m); //値２
while(wn!=wm)
{ if (wn>wm) wn -= wm;
else wm -= wn;
}
var lcm = n*m/wn;
return {gcm:wn, lcm:lcm};
}
var d1 = prompt("DATA-1 を入力してください");
var d2 = prompt("DATA-2 を入力してください");
onload = function()
{ var {gcm, lcm}= glcm(d1, d2);
document.write("DATA-1:", d1, " DATA-2:", d2,
"<br>\nGCM:", gcm, " LCM:", lcm);
}
</script>
|
return {gcm:wn, lcm:lcm};
|
var {gcm, lcm}= glcm(d1, d2);
|
<script>
function gcmlcm()
{ this.nm;
this.gcm = function(n, m)
{ var wn = parseInt(n); //値１
var wm = parseInt(m); //値２
while(wn!=wm)
{ if (wn>wm) wn -= wm;
else wm -= wn;
}
return wn;
}
this.lcm = function(n, m)
{ this.nm= parseInt(n)*parseInt(m);
return this.nm/this.gcm(n, m);
}
this.disp = function(n, m)
{ var str= "GCM(" + n + ", " + m + ")=" + this.gcm(n,m) +
" : LCM(" + n + ", " + m + ")=" + this.lcm(n,m) + "<br>\n";
return str;
}
}
var cls = new gcmlcm();
d1 = prompt("DATA-1 を入力してください");
d2 = prompt("DATA-2 を入力してください");
document.write(cls.gcm(d1, d2) + "<br>\n");
document.write(cls.lcm(d1, d2) + "<br>\n");
document.write(cls.disp(d1, d2) + "<br>\n");
</script>
|
<form name="test">
<input type="file" id="selfile" /><br/>
</form>
<script type="text/javascript">
var obj1 = document.getElementById("selfile");
//ダイアログでファイルが選択された時
obj1.addEventListener("change",function(evt)
{ var file = evt.target.files;
var reader = new FileReader();
reader.readAsText(file[0]);
//読込終了後の処理
reader.onload = function(ev)
{ window.alert(reader.result); }
},false);
</script>
|
<form name="test">
<input type="file" id="selfile" /><br/>
</form>
<script type="text/javascript">
var obj1 = document.getElementById("selfile");
//ダイアログでファイルが選択された時
obj1.addEventListener("change",function(evt)
{ var file = evt.target.files;
var reader = new FileReader();
reader.readAsText(file[0]);
//読込終了後の処理
reader.onload = function(ev)
{ var str= reader.result;
arr= new Array();
var w1= str.split("\n");
window.alert(w1);
for(var i=0; i<w1.length; i++)
{ if (w1[i].length<4) continue;
var w2= w1[i].replace(" \r", "");
var w2= w2.split(" ");
arr.push(w2);
}
for(var i=0; i<arr.length; i++)
{ for(var j=0; j<arr[i].length; j++)
{ document.write(i + "," + j + "=" + arr[i][j] + " ");
}
document.write("<br>\n");
}
}
},false);
</script>
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前田稔の超初心者のプログラム入門
超初心者のプログラム入門(JavaScript)