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JavaScript ??????

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发表于 2017-5-18 15:25:19 | 显示全部楼层 |阅读模式
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  • ?????Pascal??????????????????
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  • Null???null??Object????????????????????????????
  • Undefined?????????????null????????????
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?.??P.S.?????????????
Appropriately written comments help tell the story of code, allowing other developers to drop into a part of the story without needing to hear the beginning.
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/* * comment line1 * comment line2 */???
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  • ??????hack
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??????????????????????????????????????Eclipse???
/** * ??????????? * * @method add * @param {Number} ??????? * @return {Boolean} ????/?? * @throw {TypeError} ??????? */function add(item){    if(typeof item === "number"){        arr.push(item)    }    else{        throw new TypeError();    }}?.?????????????
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if???????????????????
if (expr) {    code}switch??
  • ???case?switch???break??1?
  • case?????????//falls through??case??????
  • default???default?????//no default????default
P.S.?JavaScript??????????????????case????????????????bug????????????????????
with??
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for??
??????????????????for???????????????hosting??????bug???????????
for-in??
?????????????????hasOwnProperty?????????????????????
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??? = ???? + ???? + ??????????????
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eval
??eval()?new Function()????????setTimeout()?setInterval()
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???new Boolean(), new String(), new Number()
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