html全选反选

DOCTYPE html>

	
		
		全选反选
	
	
		
			唱歌
			跳舞
			rap
			篮球
		
		
		
		
		
	



	
	hobby = document.getElementById('hobby')
	var ainput = hobby.getElementsByTagName('input')
	var len = ainput.length
	
	
	function all_check() {
		for(var i=0;i