拓扑topo新动画效果，纯js和canvas绘制，支持多平台uniapp，微信小程序展示

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init(){
    this.domRef = this.$refs.canvas;
    this.w = this.domRef.width = this.domRef.clientWidth,
    this.h = this.domRef.height = this.domRef.clientHeight;
    this.ctx = this.domRef.getContext("2d");
    this.ctx.textAlign = "center";
    this.ctx.textBaseline = "top";
    this.ctx.font = "18px 黑体";
    this.dotMove();
},