Example code for passing value defaults with JS _javascript tips

Source: Internet
Author: User

The requirements and code are as follows:

"That's My Code:"

<input type= "text" id= "Price2" value= "333"/> <input type=
"text" id= "Trueprice" value= ""/>
<script type= "Text/javascript" >
document.getElementById ("Price2"). onkeyup = function () {
document.getElementById ("Trueprice"). Value = This.value;
}
</script>

Question: Open this page now, trueprice the value default is empty, how can realize the default open this page Trueprice already and Price2 same? (Price2 is a dynamic value)
<input type= "text" id= "Trueprice" value= ""/> is fixed and cannot be modified

One of my simple implementations:

<! DOCTYPE html>

 
 

Effect:



The contents entered in the first text box can be synchronized to the second text box

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