我想打印时间时把之前打印的时间的清掉，只让他打印一次，求解var str = ""function getTime(){ document.write(str) var data = new Date() var year = data.getFullYear() var mon = data.getMonth() var day = data.getDate() var hour = data.getHours() var min = data.getMinutes() var sec = data.getSeconds() str = year+"年"+mon+"月"+day+"日"+hour+"时"+min+"分"+sec+"秒" document.write(str)}getTime() setInterval(getTime,1000)
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