Home > Article > Web Front-end > h5 production performance change line chart
This time I will bring you a line chart of h5 production performance changes. What are the precautions for making h5 performance change line charts? The following is a practical case, let's take a look.
By dynamically setting the inner element height =>
<!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;//当前值
this.width = parseInt(this.el.clientWidth) this.last=this.width-1;//从左往右最后一个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) {//绘制事件
this.value = value;//记录当前值
for (var i = 0; i <this.last; i++) {//遍历前x-1个,将后一个值赋给前一个
var tmph = this.el.getElementsByTagName("span")[i + 1].style.height;//获取下一个值
this.el.getElementsByTagName("span")[i].style.height = tmph;//赋给当前的
} this.el.getElementsByTagName("span")[this.last].style.height = parseInt(this.el.clientHeight) * (100 - this.value) / 100 + "px";//设置最后span一个高度=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(${val})`
demo.draw(val);
}, 100); function rand(begin, end) { return Math.floor(Math.random() * (end - begin)) + begin;
} </script></body></html>2. Through Canvas =>[Example]
<!DOCTYPE html><html><head>
<meta charset="UTF-8">
<title>示例2</title>
<style>
#title { margin: 2px; font-family: Helvetica, Arial, sans-serif; font-size: 9px; font-weight: bold; line-height: 15px; color: rgb(0, 255, 255);
} #demo {
margin: 2px
} span.col { width: 1px; height: 100%; float: left; opacity: 0.9; background: rgb(0, 0, 34);
} </style></head><body>
<div style=" opacity: 0.9; cursor: pointer; position: absolute; top: 0px;margin: 10px; background: rgb(0, 0, 34);">
<div id="title"></div>
<canvas id="demo" width="74" height="30"></canvas>
</div>
<script>
function fillLineChart(id) { this.id = id; this.canvas = document.getElementById(id); this.value = 0; this.width = (this.canvas.clientWidth)//获取Binding width
this.height = (this.canvas.clientHeight) //获取高度宽度
this.context = this.canvas.getContext("2d"); this.values = []; this.last = this.width - 1;//最后一个值的索引
for (var i = 0; i < this.width; i++) {//初始化值
this.values.push(this.height);
} this.draw = function (value) { this.value = value;//记录当前值
this.context.clearRect(0, 0, this.width, this.height);//清空
this.context.beginPath();//开辟新的绘制路径
this.context.moveTo(0, this.height);//绘制起点
for (var i = 0; i <this.last; i++) { this.values[i] = this.values[i + 1];//移动索引值
this.context.lineTo(i, this.values[i]);//结束位置
} this.values[this.last] = this.height * (100 - value) / 100;//获取最后索引一个值
this.context.lineTo(this.last, this.values[this.last]);//设置最后一个索引位置
this.context.lineTo(i, this.height);//绘制结束
this.context.fillStyle = ' rgb(0, 255, 255)';//填充绘制区域的颜色
this.context.fill();//填充
}
} var demo = new fillLineChart("demo"); var val = 0
setInterval(function () {
val = rand(rand(20, 50), 60); document.getElementById('title').innerHTML = `示例(${val})`
demo.draw(val);
}, 100); function rand(begin, end) { return Math.floor(Math.random() * (end - begin)) + begin;
} </script></body></html>3.Canvas enhancement=>[Example]
<!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/>填充显示</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;//是否填充颜色
this.canvas.width = this.width = o.width || (this.canvas.clientWidth);//获取绑定宽度
this.canvas.height = this.height = o.height || (this.canvas.clientHeight);//获取高度宽度
this.context = this.canvas.getContext("2d"); this.values = []; this.last = this.width - 1;//最后一个值的索引
for (var i = 0; i < this.width; i++) {//初始化值
this.values.push(this.height);
} this.draw = function (value) { this.value = value;//记录当前值
this.context.clearRect(0, 0, this.width, this.height);//清空
this.context.beginPath();//开辟新的绘制路径
this.context.moveTo(0, this.isFull ? this.height : this.values[1]);//绘制起点
for (var i = 0; i < this.last; i++) { this.values[i] = this.values[i + 1];//移动索引值
this.context.lineTo(i, this.values[i]);//结束位置
} this.values[this.last] = this.height * (100 - value) / 100;//获取最后索引一个值
this.context.lineTo(this.last, this.values[this.last]);//设置最后一个索引位置
if (this.isFull) { this.context.lineTo(i, this.height);//绘制结束
this.context.fillStyle = this.color;//填充绘制区域的颜色
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>I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!
Related reading:
What is the difference between python3 and JS
js/css dynamically loading JS plug-in
The above is the detailed content of h5 production performance change line chart. For more information, please follow other related articles on the PHP Chinese website!