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循环测试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("
");