Clearing the textbox values onclick and displaying onblur

有没有办法清除文本框上的默认文本框值onclick并在窗体页面上显示多个文本框的onblur？

---

function Clear1(str)
{    
   document.getElementById(str).value= "";
}

function Clear2(str2)
{    
var aa1=document.getElementById(str2);
	if (aa1.value==""){  
    document.getElementById(str2).style.backgroundColor = "#ffcccc"; 
	}else{
    document.getElementById(str2).style.backgroundColor = "#ffffff";   
  }
}

<input type="text" value="test1" onClick="Clear1(this.id);" id="textbox1" onblur="Clear2(this.id);">
<input type="text" value="test2" onClick="Clear1(this.id);" id="textbox2" onblur="Clear2(this.id);">
<input type="text" value="test3" onClick="Clear1(this.id);" id="textbox3" onblur="Clear2(this.id);">
<input type="text" value="test4" onClick="Clear1(this.id);" id="textbox4" onblur="Clear2(this.id);">




    

---

HTML:

<input type="text" value="" onClick="Clear();" id="textbox1>
<input type="text" value="" onClick="Clear();" id="textbox2>
<input type="text" value="" onClick="Clear();" id="textbox3>
<input type="text" value="" onClick="Clear();" id="textbox4>

Javascript :

function Clear()
{    
   document.getElementById("textbox1").value= "";
   document.getElementById("textbox2").value= "";
   document.getElementById("textbox3").value= "";
   document.getElementById("textbox4").value= "";
}

Your question was a little vague to me, but the above will clear all the textboxes when one is clicked. Hopefully this helps you.

---

One Line solution

  <input type="text" value="" onClick="this.value='';" id="textbox1">

or

 <input type="text" value="" onClick="this.value=='Initial Text'?this.value='':this.value;" id="textbox1">

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