📄 script02.js
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window.onload = initForm;function initForm() { document.getElementById("months").selectedIndex = 0; document.getElementById("months").onchange = populateDays;}function populateDays() { var monthDays = new Array(31,28,31,30,31,30,31,31,30,31,30,31); var monthStr = this.options[this.selectedIndex].value; if (monthStr != "") { var theMonth = parseInt(monthStr); document.getElementById("days").options.length = 0; for(var i=0; i<monthDays[theMonth]; i++) { document.getElementById("days").options[i] = new Option(i+1); } }}
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