h5制作性能变化折线图

2020-07-26 19:29:21 来源：易采站长站作者：

这次给大家带来h5制作性能变化折线图，h5制作性能变化折线图的注意事项有哪些，下面就是实战案例，一起来看一下。

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>

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