js 获取页面中全部文本框,并判断是否为空; Javascript

function pdqbwb() {
var itxt = document.getElementsByTagName("input");
var b = 0;
for (h = 0; h < itxt.length; h++) {
var atype = itxt[h].type;
if (atype == "text" && itxt[h].value=="") {
alert('NO');
return;
}

}

alert("yes");
}