<script type="text/javascript">
		//构造函数
		function Methods() {
		}

		//原型随机数方法
		Methods.prototype.maxrandom=function(){
			return function(max,min){
				return Math.floor(Math.random()*(max-min)+min)
			}
		}

		//原型随机颜色方法
		Methods.prototype.colors=function(){
			var that = this;
			return function(){
				let r =  that.maxrandom()(255,0);
				let g =  that.maxrandom()(255,0);
				let b =  that.maxrandom()(255,0);
				return "rgb("+r+','+g+','+b+")";
			}
		}

		//实例对象
		let myinit = new Methods();
		
		console.log(myinit.maxrandom()(100,1));
		console.log(myinit.colors()())
	</script>

 is_weixn_qq(){
        var ua = navigator.userAgent.toLowerCase();
        //如果是微信和QQ隐藏内容
        if(ua.match(/MicroMessenger\/[0-9]/i)||ua.match(/QQ\/[0-9]/i)){
           this.iswx=true;
           this.tgqd='0';
           return
        }else{
            //如果不是微信和Qq计算pv
            this.init()
        }
    }

// blob to base64
function blobTobase64(blob) {
    const fileReader = new FileReader()
	let base64 = ''
	fileReader.onload = () => {
  		base64 = fileReader.result // 读取base64
	}
	fileReader.readAsDataURL(blob) // 读取blob
}
// base64 to blob
function dataURItoBlob(dataURI) {
  var mimeString = dataURI
    .split(',')[0]
    .split(':')[1]
    .split(';')[0] // mime类型
  var byteString = atob(dataURI.split(',')[1]) //base64 解码
  var arrayBuffer = new ArrayBuffer(byteString.length) //创建ArrayBuffer
  var intArray = new Uint8Array(arrayBuffer) //创建视图
  for (var i = 0; i < byteString.length; i++) {
    intArray[i] = byteString.charCodeAt(i)
  }
  return new Blob([intArray], { type: mimeString }) // 转成 blob
}