var c=[2,4,3,5,2,2,2],

		a = {},

		i = 0;

		for(;i<c.length;i++){

			a[c[i]] = 1   //利用对象名称不能重复的特性来去重

		}

		c=[];

		for(var g in a){

			c.push(g-0);

		}

		console.log(c);