this Keyword
You can use 'this' keyword to refer to the current object.
this' refers to the calling object in a method
function validate(obj, lower, upper) {
if ( (obj.value < lower) || (obj.value > upper) ) {
alert('out of range');
}
}
<input type="text" name="age" size="3"
onChange="validate(this, 18, 99)">
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