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好好学一遍JavaScript 笔记(一)
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在此、僅僅記下重要的東西！這一章主要是基礎、基礎中的基礎！
<script?language="javaScript">????????????????????alert(null?==?undefined);????????????????????????var?strings?=?"'??天??????????????????天?向?上'?"?;???????????alert(trimFunction(strings));?????????????????????????????????????????function?trimFunction(str){????????????????return?str.replace(/\s/g,"");???????????}???</script>??? <script?language="javaScript">??????????????????????????alert(isNaN("fdsa"));???????????????????????????alert("saffdsa".length);??????????????????????????????var?iNumber?=?10.6?;???????????alert(iNumber.toString(2));???????????alert(iNumber.toString(8));??????????alert(iNumber.toString());???????????alert(iNumber.toString(16));???</script>??? ????????????????????????????????????????????????????????????????????????????????????????????????????????alert(Number("0010.23"));??? ????????var?numberObj?=?new?Number(99);????alert(numberObj.toFixed(2));? ???????????????????????var?stringObj?=?new?String("Hello?World");?????var?resultObj?=?stringObj.concat("string2","string3","stringN","string5");??????????????????? ?????????????????????????????????????????????????????????????????????????????????var?spliceArr?=?new?Array("red",2,9,4,6);??????????spliceArr.splice(0,2);????alert(spliceArr);??????????????????spliceArr.splice(1,2,"blue","yellow","三項");?????alert(spliceArr);??
轉載于:https://blog.51cto.com/hzw2312/748473
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