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String.prototype.getLength = function() {
return this.replace(/[^\x00-\xff]/g, '**').length;
}
var _form = document.getElementsByTagName('form')[0]
_form.onsubmit = function() {
var inputs = _form.children;
for (var i = 0, count = inputs.length; i < count; i++) {
if (inputs[i].type != 'submit' && inputs[i].value.getLength() > i + 1) {
alert('不可多于' + (i + 1) + '个字符');
return false;
}
}
}