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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>一个简单的二分逼近的小工具</title>
<script>
var minim, maxim, sub, res;
function displayResult()
{
document.getElementById("result").innerHTML = "现在的结果是：" + res;
}
function initial()
{
minim = document.getElementById("minimum").value;
maxim = document.getElementById("maximum").value;
sub = ((Number(maxim) - Number(minim)) / 4);
res = ((Number(maxim) + Number(minim)) / 2);
displayResult();
document.getElementById("mis").setAttribute("style", "opacity: 1")
document.getElementById("mil").setAttribute("style", "opacity: 1")
}
function makeItSmaller()
{
res = Number(res) - Number(sub);
sub = Number(sub) / 2;
displayResult();
}
function makeItLarger()
{
res = Number(res) + Number(sub);
sub = Number(sub) / 2;
displayResult();
}
</script>
</head>
<p>请在左侧的方框填入最小值，右侧的方框填入最大值，以确定一个范围</p>
<input type="number" id="minimum">
<input type="number" id="maximum">
<button onclick="initial()">填完最小最大值之后点我</button>
<p id="result"></p><br>
<button id="mis" onclick="makeItSmaller()" style="opacity: 0">让结果更小</button>
<nobr> </nobr>
<button id="mil" onclick="makeItLarger()" style="opacity: 0">让结果更大</button>
<br><br><br><br><br><br><br>
</html>