判斷輸入的全是空格
var account = document.getElementById(“account”).value.trim();
var password = document.getElementById(“password”).value.trim();
if (account==""|| password==""){ ?
alert(‘全是空格’);
}
function test() {
var dom = document.getElementById(‘id’);
var value = dom.value;
value = value.replace(’\s+’, ‘’); //關鍵是這一句，把value中的空格全replace成空字串
if(value.length > 0) {
} else {
alert(‘全是空格’);
}
}