var a=15
在 <input type= "text " name= "R2 " value= " " size= "15 "> 语句中value怎么赋变量a,在网页上才可以显示15。
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用JS
var a = 15;
document.formname.R2.value = a;
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<body>
<input type= "text " value= " " name= "txt1 " id= "txt1 ">
<script>
var txt1=document.getElementById( "txt1 ")
var a=15;
alert(txt1.value);
txt1.value=a;
alert(txt1.value);
</script>
</body>