kni*_*ght 3 html javascript css height width
我试图增加div的宽度和高度,以便在一定的时间内内圈应该通过增加它的大小来填充外圈.我能够做所有事情,但只是位置导致一些问题.随着内圈的尺寸增加,其失去其中心位置并向右下方增加.如何保持增加其宽度和高度,但保持在中心,以便在完成时完全填满外圈.非常感谢
var outer, inner, width, interval, height;
inner = document.querySelector(".inner");
width = 0;
height = 0;
window.addEventListener("load", function () {
interval = setInterval(function () {
if (width >= 200 && height >= 200) {
inner.textContent = "100% Completed";
clearInterval(interval);
}
else {
width += 3.333;
height += 3.333;
inner.style.width = width + "px";
inner.style.height = height + "px";
}
}, 1000);
});.outer {
width: 200px;
height: 200px;
border: 5px solid tomato;
border-radius: 50%;
margin: 100px auto;
position: relative;
}
.inner {
width: 0;
height: 0;
background-color: tomato;
position: absolute;
top: 50%;
left: 50%;
border-radius: 50%;
}<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
</head>
<body>
<div class="outer">
<div class="inner"></div>
</div>
</body>
</html>您只需要transform: translate(-50%, -50%);在inner圆类中添加一个.这可确保其正确居中.
var outer, inner, width, interval, height;
inner = document.querySelector(".inner");
width = 0;
height = 0;
window.addEventListener("load", function(){
interval = setInterval(function(){
if ( width >= 200 && height >= 200 ) {
inner.textContent = "100% Completed";
clearInterval(interval);
}
else {
width += 3.333;
height += 3.333;
inner.style.width = width + "px";
inner.style.height = height + "px";
}
},500);
});.outer {
width: 200px;
height: 200px;
border: 5px solid tomato;
border-radius: 50%;
margin: 100px auto;
position: relative;
}
.inner {
width: 0;
height: 0;
background-color: tomato;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
border-radius: 50%;
}<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
</head>
<body>
<div class="outer">
<div class="inner"></div>
</div>
</body>
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