1.通過動态設定内部元素高度 => 示例 <=
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>示例1</title>
<style>
#title {
margin: 2px;
font-family: Helvetica, Arial, sans-serif;
font-size: 9px;
font-weight: bold;
line-height: 15px;
color: rgb(0, 255, 255);
}
#demo {
width: 74px;
height: 30px;
background: rgb(0, 255, 255);
margin: 2px
}
span.col {
width: 1px;
height: 100%;
float: left;
opacity: 0.9;
background: rgb(0, 0, 34);
}
</style>
</head>
<body>
<div style=" opacity: 0.9; cursor: pointer; position: absolute; top: 0px;margin: 10px; background: rgb(0, 0, 34);">
<div id="title"></div>
<div id="demo"></div>
</div>
<script>
function fillLineChart(id) {
this.id = id;
this.el = document.getElementById(id);
this.value = 0;//目前值
this.width = parseInt(this.el.clientWidth)
this.last=this.width-1;//從左往右最後一個span的索引
for (var i = 0; i < this.width; i++) {//初始化span
this.el.innerHTML +='<span class="col"></span>';
}
this.draw = function (value) {//繪制事件
this.value = value;//記錄目前值
for (var i = 0; i <this.last; i++) {//周遊前x-1個,将後一個值賦給前一個
var tmph = this.el.getElementsByTagName("span")[i + 1].style.height;//擷取下一個值
this.el.getElementsByTagName("span")[i].style.height = tmph;//賦給目前的
}
this.el.getElementsByTagName("span")[this.last].style.height = parseInt(this.el.clientHeight) * (100 - this.value) / 100 + "px";//設定最後span一個高度=span容器的高度x值百分比
}
}
var demo = new fillLineChart("demo");
var val = 0
setInterval(function () {
val = rand(rand(20, 50), 60);
document.getElementById('title').innerHTML = `示例(${val})`
demo.draw(val);
}, 100);
function rand(begin, end) {
return Math.floor(Math.random() * (end - begin)) + begin;
}
</script>
</body>
</html>
1.gif
2.通過Canvas =>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>示例2</title>
<style>
#title {
margin: 2px;
font-family: Helvetica, Arial, sans-serif;
font-size: 9px;
font-weight: bold;
line-height: 15px;
color: rgb(0, 255, 255);
}
#demo {
margin: 2px
}
span.col {
width: 1px;
height: 100%;
float: left;
opacity: 0.9;
background: rgb(0, 0, 34);
}
</style>
</head>
<body>
<div style=" opacity: 0.9; cursor: pointer; position: absolute; top: 0px;margin: 10px; background: rgb(0, 0, 34);">
<div id="title"></div>
<canvas id="demo" width="74" height="30"></canvas>
</div>
<script>
function fillLineChart(id) {
this.id = id;
this.canvas = document.getElementById(id);
this.value = 0;
this.width = (this.canvas.clientWidth)//擷取綁定寬度
this.height = (this.canvas.clientHeight) //擷取高度寬度
this.context = this.canvas.getContext("2d");
this.values = [];
this.last = this.width - 1;//最後一個值的索引
for (var i = 0; i < this.width; i++) {//初始化值
this.values.push(this.height);
}
this.draw = function (value) {
this.value = value;//記錄目前值
this.context.clearRect(0, 0, this.width, this.height);//清空
this.context.beginPath();//開辟新的繪制路徑
this.context.moveTo(0, this.height);//繪制起點
for (var i = 0; i <this.last; i++) {
this.values[i] = this.values[i + 1];//移動索引值
this.context.lineTo(i, this.values[i]);//結束位置
}
this.values[this.last] = this.height * (100 - value) / 100;//擷取最後索引一個值
this.context.lineTo(this.last, this.values[this.last]);//設定最後一個索引位置
this.context.lineTo(i, this.height);//繪制結束
this.context.fillStyle = ' rgb(0, 255, 255)';//填充繪制區域的顔色
this.context.fill();//填充
}
}
var demo = new fillLineChart("demo");
var val = 0
setInterval(function () {
val = rand(rand(20, 50), 60);
document.getElementById('title').innerHTML = `示例(${val})`
demo.draw(val);
}, 100);
function rand(begin, end) {
return Math.floor(Math.random() * (end - begin)) + begin;
}
</script>
</body>
</html>
2.gif
3.Canvas增強 =>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>示例3</title>
<style>
#title {margin: 2px;
font-family: Helvetica, Arial, sans-serif;
font-size: 9px;
font-weight: bold;
line-height: 15px;
color: rgb(0, 255, 255);}
#demo {margin: 2px}
span.col {
width: 1px;
height: 100%;
float: left;
opacity: 0.9;
background: rgb(0, 0, 34);}
</style>
</head>
<body>
<label ><input type="checkbox" onclick="demo.isFull=this.checked" checked/>填充顯示</label>
<div style=" opacity: 0.9; cursor: pointer; position: absolute; top: 30px;margin: 10px; background: rgb(0, 0, 34);">
<div id="title"></div>
<canvas id="demo"></canvas>
</div>
<script>
function lineChart(o) {
this.id = o.id;
this.canvas = document.getElementById(o.id);
this.color = o.color || 'rgb(0, 255, 255)';
this.value = 0;
this.isFull = o.isFull || false;//是否填充顔色
this.canvas.width = this.width = o.width || (this.canvas.clientWidth);//擷取綁定寬度
this.canvas.height = this.height = o.height || (this.canvas.clientHeight);//擷取高度寬度
this.context = this.canvas.getContext("2d");
this.values = [];
this.last = this.width - 1;//最後一個值的索引
for (var i = 0; i < this.width; i++) {//初始化值
this.values.push(this.height);
}
this.draw = function (value) {
this.value = value;//記錄目前值
this.context.clearRect(0, 0, this.width, this.height);//清空
this.context.beginPath();//開辟新的繪制路徑
this.context.moveTo(0, this.isFull ? this.height : this.values[1]);//繪制起點
for (var i = 0; i < this.last; i++) {
this.values[i] = this.values[i + 1];//移動索引值
this.context.lineTo(i, this.values[i]);//結束位置
}
this.values[this.last] = this.height * (100 - value) / 100;//擷取最後索引一個值
this.context.lineTo(this.last, this.values[this.last]);//設定最後一個索引位置
if (this.isFull) {
this.context.lineTo(i, this.height);//繪制結束
this.context.fillStyle = this.color;//填充繪制區域的顔色
this.context.fill();//填充
} else {
this.context.strokeStyle = this.color;
this.context.stroke();
}
}
}
var demo = new lineChart({
id: "demo",
width: "74",
height: "30",
isFull: true,
});
var val = 0
setInterval(function () {
val = rand(rand(20, 50), 60);
document.getElementById('title').innerHTML = `示例(${val})`
demo.draw(val);
}, 100);
function rand(begin, end) {
return Math.floor(Math.random() * (end - begin)) + begin;
}
</script>
</body>
</html>
3.gif