对数组打乱洗牌：

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/*
* @param {Array} array 待洗牌数组
*/
const shuffle = (array) => array.sort(()=> Math.random()>.5 );
shuffle([1,2,3,4,5,6]) //[2,1,5,3,6,4]

将url query参数全部取出，返回obj:

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function queryString(url){
	var str = url || window.location.href;
	var reg = /(?:&|\?)(\w+)=([^#&$\/]+)/g
	var queryObj = {};
	while(true) {
		var match = reg.exec(str);
		if (!match) break;
		if(match[1]){
			queryObj[match[1]] = match[2];
		}
	}
	return queryObj;
}

简单实现bind方法：

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Function.prototype.bind = function(obj){
	let _self = this, arg = arguments;
	return function(){
		_self.apply(obj || this, Array.prototype.slice.call(arg,1));
	}
}