关闭此页面html代码,请教问题：怎么在prompt()之前关闭页面，代码如下：

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var v1,v2;

var i;

for (i = 0; i < 1; ) {

v1=prompt("请输入第一个数","1");

v2 = prompt("请输入第二个数", "1");

if (v1 == null || v1 == "" || v2 == null || v2 == "") {

alert("包含非法字符！请重新输入有效字符！");

continue;

}

else if (isNaN(v1) || isNaN(v2)) {

alert("X或Y输入的不是数字！请输入数字！");

continue;

}

else if (v2 == 0) {

alert("Y不能是0！");

continue;

}

else

var ss = parseInt(v1) + parseInt(v2);

break;

}

document.write("

document.write("

");

document.write("

");

document.write("第一个数");

document.write("

");

document.write("

");

document.write("第二个数");

document.write("

");

document.write("

");

document.write("求和结果");

document.write("

");

document.write("

");

document.write("

");

document.write("

");

document.write(v1);

document.write("

");

document.write("

");

document.write(v2);

document.write("

");

document.write("

");

document.write(ss);

document.write("

");

document.write("

");

document.write("

");