复制代码 代码如下:

<script>

function doclick1(){

var txtN = document.getElementsByTagName("input");

for(i=0;i<txtN.length;i++){

if(txtN[i].type="text"){

txtN[i].readOnly=false;

}

}

}

</script>

<input type="text" id="contactus1" readonly>

<input type="text" id="contactus2" readonly>

<input type="text" id="contactus3" readonly>

<input type="button" name="button4" value="修改" />