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<form name="form1" onsubmit="chknum()" action="3.htm">
<input name="quantity">
<input name="quantity">
<input name="quantity">
<input name="quantity">
<input type="submit" value="确定" >
function chknum(){
var qs = document.getElementsByName("quantity");
for(var i=0;i<qs.length;i++){
if(qs[i].value=="0"){
alert("输入有误!");
qs[i].focus();
return false;
}
}
return true;
}
function chknum(){
var qs = document.getElementsByName("quantity");
for(var i in qs){
if(qs[i].value=="0"){
alert("输入有误!");
qs[i].onfocus();
return false;
}
}
return true;
}