h5制作机能变化折线图-

这次给大家带来h5制作机能变化折线图，h5制作机能变化折线图的注意事项是什么，下面就是实战案例，一起来看一下。 这次给大家带来h5制作机能变化折线图，h5制作机能变化折线图的注意事项是什么，下面就是实战案例，一起来看一下。

通过动态设定内部元素高度 =>

    
    
    
    
    
    
    
        
        
    
    《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;//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 +='';
            }            this.draw = function (value) {//绘制事件
                this.value = value;//记载目前值
                for (var i = 0; i 

2.通过Canvas =>[示例]

    
    
    
    
        
        
    
    《script》
        function fillLineChart(id) {            this.id = id;            this.canvas = document.getElementById(id);            this.value = 0;            this.width = (this.canvas.clientWidth)//猎取

绑定宽度

           this.height = (this.canvas.clientHeight) //猎取高度宽度 
            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 

3.Canvas加强 =>[示例]

   
   
   
   添补显示
   
       
       
   
   《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;//可否添补色彩
           this.canvas.width = this.width = o.width || (this.canvas.clientWidth);//猎取绑定宽度
           this.canvas.height = this.height = o.height || (this.canvas.clientHeight);//猎取高度宽度 
           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》 

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