<body> ???<input type="text" value="请输入内容" id="text1" /></body><script> ???????var oText1=document.getElementById("text1"); ???????oText1.onfocus=function(){ ???????????if(this.value=="请输入内容"){ ???????????????this.value=‘‘; ???????????} ???????} ???????oText1.onblur=function(){ ???????????if(this.value==‘‘){ ???????????????this.value=="请输入内容"; ???????????} ???????}</script>原生js实现placeholder ?当获取焦点时清空，失去焦点且为空时恢复
原文地址：https://www.cnblogs.com/150536FBB/p/9783572.html