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这篇文章主要为大家详细介绍了h5实现性能变化折线图，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下。
通过动态设置内部元素高度 =>
<!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(${val})`
demo.draw(val);
}, 100); function rand(begin, end) { return Math.floor(Math.random() * (end - begin)) + begin;
} </script></body></html>2.通过Canvas =>[示例]
<!DOCTYPE html><html><head>
<meta charset="UTF-8">
<title>示例2</title>
<style>
#title { margin: 2px; font-family: Helvetica, Arial, sans-serif; font-size: 9px; font-weight: bold; line-height: 15px; color: rgb(0, 255, 255);
} #demo {
margin: 2px
} span.col { width: 1px; height: 100%; float: left; opacity: 0.9; background: rgb(0, 0, 34);
} </style></head><body>
<div style=" opacity: 0.9; cursor: pointer; position: absolute; top: 0px;margin: 10px; background: rgb(0, 0, 34);">
<div id="title"></div>
<canvas id="demo" width="74" height="30"></canvas>
</div>
<script>
function fillLineChart(id) { this.id = id; this.canvas = document.getElementById(id); this.value = 0; this.width = (this.canvas.clientWidth)//获取绑定宽度
this.height = (this.canvas.clientHeight) //获取高度宽度
this.context = this.canvas.getContext("2d"); this.values = []; this.last = this.width - 1;//最后一个值的索引
for (var i = 0; i < this.width; i++) {//初始化值
this.values.push(this.height);
} this.draw = function (value) { this.value = value;//记录当前值
this.context.clearRect(0, 0, this.width, this.height);//清空
this.context.beginPath();//开辟新的绘制路径
this.context.moveTo(0, this.height);//绘制起点
for (var i = 0; i <this.last; i++) { this.values[i] = this.values[i + 1];//移动索引值
this.context.lineTo(i, this.values[i]);//结束位置
} this.values[this.last] = this.height * (100 - value) / 100;//获取最后索引一个值
this.context.lineTo(this.last, this.values[this.last]);//设置最后一个索引位置
this.context.lineTo(i, this.height);//绘制结束
this.context.fillStyle = ' rgb(0, 255, 255)';//填充绘制区域的颜色
this.context.fill();//填充
}
} var demo = new fillLineChart("demo"); var val = 0
setInterval(function () {
val = rand(rand(20, 50), 60); document.getElementById('title').innerHTML = `示例(${val})`
demo.draw(val);
}, 100); function rand(begin, end) { return Math.floor(Math.random() * (end - begin)) + begin;
} </script></body></html>3.Canvas增强 =>[示例]
<!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>以上就是h5实现性能变化折线图的具体操作，代码应该是足够清楚的，而且我也相信有相当的一些例子可能是我们日常工作可能会见得到的。通过这篇文章，希望你能收获更多。
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