<html>
<body>
<input type="checkbox" class='all'>/*未定义value值*/
<script>
var all=document.getElementsByTagName('input');
console.log(all);
all[0].onclick=function(ev){
var ev = ev || window.event;
var target = ev.target || ev.srcElement;
console.log(target.value);//输出input的value值;
}
</script>
</body>
</html>
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