js 随机打乱数组

          var randArray =  function( data ){
			//获取数组长度
		    var arrLen = data.length;
		    //创建数组 存放下标数
		    var try1 = new Array();
		    for( var i = 0 ; i < arrLen ; i++ ){
		        try1[i] = i;
		    }
		    //创建数组 生成随机下标数
		    var try2 = new Array();
		    for( var i = 0 ; i < arrLen ; i++ ){
		        try2[i] = try1.splice(Math.floor(Math.random() * try1.length),1);
		    }
		    //创建数组，生成对应随机下标数的数组
		    var try3 = new Array();
		    for( var i = 0 ; i < arrLen ; i++){
		        try3[i] = data[ try2[i] ];
		    }
		    return try3;
		}