js计算怀孕周期的方法

js计算怀孕周期的方法，js计算怀孕周期代码教程如下：

随机末次月经时间

实现结果：计算出目前处于孕期多少周和预产期日期

js实现代码如下：

function yunchan() {var year = document.getElementById('wyear');var month = document.getElementById('wmonth');var day = document.getElementById('wday');if (year.value == "" || month.value == "" || day.value == "") {alert("璇峰～鍐欏畬鏁村勾鏈堟棩!");return;}if (year.value > 2050 || year.value < 1990) {alert("璇峰～鍐欐纭勾浠�!");year.focus();return;}if (month.value > 12 || month.value < 1) {alert("璇峰～鍐欐纭湀浠�!");month.focus();return;}if (day.value > 31 || day.value < 1) {alert("璇峰～鍐欐纭棩瀛�!");day.focus();return;}if (!isDate(year.value, month.value, day.value)) {alert("骞存湀鏃ョ粍鍚堟湁閿�,璇烽噸鏂板～鍐�!");return;}function isDate(year, month, day) {// month argument must be in the range 1 - 12month = month - 1;  // javascript month range : 0- 11var tempDate = new Date(year, month, day);if ((year2k(tempDate.getFullYear()) == year) && (month == tempDate.getMonth()) && (day == tempDate.getDate())) {return true;} else {return;}}function year2k(d) {return (d < 1000) ? d + 1900 : d;}var stime = new Date();stime.setFullYear(year.value);stime.setMonth(month.value - 1);stime.setDate(day.value);var yue = document.getElementById('wperiod').value;var true_number = 280;if (yue < 28) {true_number = 280 - (28 - yue);} else if (yue > 28) {true_number = 280 + (yue - 28);} else if (yue == 28) {true_number = 280;}if (yue.value != '') {var temptime = stime.getTime();stime.setTime((stime.getTime() + true_number * 24 * 3600 * 1000))var yuchan = stime.getFullYear() + "-" + (stime.getMonth() + 1) + "-" + stime.getDate();var nowt = new Date();var chatime = nowt.getTime() - temptime;var chaweek = Math.floor((chatime) / (1000 * 60 * 60 * 24 * 7));var chaweek_1 = Math.floor((chatime) / (1000 * 60 * 60 * 24));if (chaweek < 0) chaweek = 0;if (chaweek_1 > (true_number + 14)) {alert("浣犵殑棰勪骇鏈熷凡杩�!");return null;}document.getElementById('wtext').innerHTML = '鎮ㄧ殑棰勪骇鏈熸槸 '+yuchan+'锛涚幇鍦ㄦ澶勪簬瀛曟湡鐨勭 '+chaweek+' 鍛�';document.getElementById('wresult').style.display = '';var c = document.getElementById('wresult').innerHTML;var i = '';return {c:c, i:i};} else {return null;}}function wInit() {document.getElementById('wresult').style.display = 'none';var d = new Date();d.setMonth(d.getMonth() - 8);document.getElementById('wyear').value = d.getFullYear();document.getElementById('wmonth').value = d.getMonth() + 1;document.getElementById('wday').value = d.getDate();document.getElementById('wyear').onclick = function(event) {WdatePicker({dateFmt:'yyyy',minDate:'1901', maxDate:'2050'})};document.getElementById('wmonth').onclick = function(event) {WdatePicker({dateFmt:'M'})};document.getElementById('wday').onclick = function(event) {WdatePicker({dateFmt:'d'})};var p = document.getElementById('wperiod');for (var i = 20; i <= 45; i++) {p.options.add(new Option(i + '澶�', i));}p.options[8].selected = true;
}function handleWork(obj) {var v = obj.value;obj.disabled = true;obj.value = '寮€濮嬭绠�';// global callbackhandleBegin();var res = yunchan();if (typeof res == 'object' && res != null) {// global callbackhandleFinish(res.c, res.i);}obj.value = v;obj.disabled = false;
}

显示效果：怀孕周期计算器

 参考文章：http://tishang.net/articles/1685610399.html

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