javascript常用的工具函数(四)

• 清空 LoadJS 加载到顶部的js引用

function ClearHeadJs(src) { var js = document.getElementsByTagName('head')[0].children; var obj = null; for (var i = 0; i < js.length; i++) { if (js[i].tagName.toLowerCase() == "script" && js[i].attributes['src'].value.indexOf(src) > 0) { obj = js[i]; } } document.getElementsByTagName('head')[0].removeChild(obj);};

• 按Ctrl + Entert 直接提交表单

function ctrlEnterSubmit() { evt = evt ? evt : (window.event ? window.event : null); if (13 == evt.keyCode && evt.ctrlKey) { evt.returnValue = false; evt.cancel = true; PostData(); }}

• 获取当前时间

function getCurrentDate() { function add_zero(temp) { if (temp < 10) return "0" + temp; else return temp; } var d = new Date(); var y = d.getYear() + 1900; var month = add_zero(d.getMonth() + 1); var days = add_zero(d.getDate()); var hours = add_zero(d.getHours()); var minutes = add_zero(d.getMinutes()); var seconds = add_zero(d.getSeconds()); var str = y + '-' + month + '-' + days + ' ' + hours + ':' + minutes + ':' + seconds; return str;};

• 倒计时limitTime:倒计时时间，单位为秒callFn：回调函数

setTime(limitTime,callFn) { this.timer = setInterval(() => {var h = 0, m = 0, s = 0, remainTime = 0;num -= 1;if (num == 0) { callFn(); //计时器为0时执行的函数}remainTime = limitTime - num;s = num % 60;m = parseInt(num / 60);h = parseInt(num / 60 / 60);return h + ":" + m + ":" + s; }, 1000);}