if用法（if的用法）

if的用法？

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if的用法

五星知识达人网友：七十二街 解答于 2022-03-03 16:53

1. (表示条件)如果 ,主句用将来时，if从句用现在时表示将来He will come if you invite him. 如果你请他,他会来的。 2. (表示虚拟)假如,要是

1）时态：可以表示过去，现在和将来的情况。它的基本特点是时态退后。a. 同现在事实相反的假设。句型 ： 条件从句 主句 一般过去时 should( would) +动词原形If they were here, they would help you.

b. 表示于过去事实相反的假设。句型： 条件从句 主句 过去完成时 should(would) have+ 过去分词If she had worked harder, she would have succeeded. The rice would not have been burnt if you had been more careful. If my lawyer had been here last Saturday, he would have prevented me from going.

If he had come yesterday, I should / would have told him about it.含义：He did not come yesterday, so I did not tell him about it.If he had not been ill and missed many classes, he would have made greater progress.含义： He was ill and missed many lessons, so he did not make greater progress.

c. 表示对将来的假想句型： 条件从句 主句一般过去时 should+ 动词原形were+ 不定式 would + 动词原形should+ 动词原形If you succeeded, everything would be all right.If you should succeed, everything would be all right.If you were to succeed, everything would be all right.

3. 是否 = whether 连接宾语从句I wonder if she is ill. 不知她是否病了。

1楼网友：往事埋风中 解答于 2022-06-03 18:29

jq用法的if用法：</script></script>title:${name}{{if emp.length}}成员：${$item.getemp(“-“)}{{/if}}title:${name}{{if emp.length==2}}成员：${$item.getemp(“-“)}{{/if}}</script>[xss_clean]var deptlist = [{ name: "销售部", emp: ["张三", "李四"] },{ name: "软件部", emp: [] },{ name: "网络部", emp: ["王二麻子", "王小"] }];$("#depttemplate").tmpl(deptlist,{getemp: function (separator) {return this.data.emp.join(separator);}}).appendto("#deptlist");</script>--输出结果

2楼网友：低音帝王 解答于 2022-02-03 18:21

if连接词 conj.1.(表示条件)如果He will come if you invite him.如果你请他,他会来的。2.(表示虚拟)假如,要是If I were you, I would never do that.如果我是你,我决不做那件事。3.(表示让步)即使We'll go even if it rains.即使下雨我们也要去。4.是否I wonder if she is ill.不知她是否病了。5.(表示因果关系)每一次...的时候(总是会)If I feel any doubt, I inquire.我一感到有疑问就随时询问。名词 n.1.条件;设想[C]There are too many ifs in his offer.他的提议中条件太多了。

3楼网友：孤老序 解答于 2022-01-03 17:56

jq用法的if用法：</script></script>title:${name}{{if emp.length}}成员：${$item.getemp("-")}{{/if}}title:${name}{{if emp.length==2}}成员：${$item.getemp("-")}{{/if}}</script>[xss_clean]var deptlist = [{ name: "销售部", emp: ["张三", "李四"] },{ name: "软件部", emp: [] },{ name: "网络部", emp: ["王二麻子", "王小"] }];$("#depttemplate").tmpl(deptlist,{getemp: function (separator) {return this.data.emp.join(separator);}}).appendto("#deptlist");</script>--输出结果

4楼网友：洒脱疯子 解答于 2022-04-03 17:04

if if[If; if]连接词A1 如果…,假使…a. [就现在、过去、未来可能实现之事加以推测时]If you are tired, we will go straight home.如果你疲倦了,我们就直接回家If you have finished reading this book, please return it to me.如果你念完这本书,请把它还给我If he did it, he committed a crime.如果他做了那件事,他就犯了罪I'll be hanged [damned] if I obey him. (口语)我才不会听他的话Do you mind if I open the window?.如果我打开窗子,你介意吗?(我可以打开窗子吗? )I shall tell him if he comes.如果他来了,我会告诉他b.If you knew how I suffered, you would pity me.如果你知道我多么受苦,你会同情我If I were you, I would help him.如果我是你,我会帮助他c.If I had known, I wouldn't have done it.假使我知道,我就不会做那件事If he had followed my advice, he wouldn't be in such difficulty now.如果他听从我的劝告,他现在就不会陷入如此的困境d.If it should rain tomorrow, I shall not [shan't, won't] come.万一明天下雨,我就不来e.If I were to die tomorrow, what would you do?.要是我明天死了,你怎么办?2 a. 即使… (even though)If he be ever so rich.?.(古)即使他很富有…If I am wrong, you are not absolutely right.即使我错,你也不一定绝对正确He is a good if mischievous boy.即使他再顽皮,还是个好孩子His manner, if patronizing, was not unkind.他的态度即使有点傲慢,也不能说是不和善I don't care if I go. (口语)我可以去; 我去也可以(对于邀请的肯定回答)→ even if,if not.b. 即使…,然而… (whereas)If he was not industrious in his youth, he now works very hard.诚然,他年轻的时候不勤奋,然而现在他工作很卖力3 每逢…时,不论何时 (whenever)If I feel any doubt,I ask.每逢有疑问时我就发问4 [省略结论的主句,单独用作表示惊叹、愿望等的感叹句]If I only knew! =If only I knew!.要是我知道的话该多好!If I haven't lost my watch!.要是没丢掉表该多好!(该死,丢了表!)Why, if it isn't Mr. Smith!.嗨,那不正是史密斯先生!B [引导间接疑问句] 是不是… (whether)Ask him if it is true.问他那是不是真的I wonder if he is in the school.我不知道他是否在学校as if → aseven if即使Even if you do not like it, you must do it.即使你不喜欢那件事,你也得去做if a day [an inch,a penny,etc.]一天 [一??一便士] 不少,确实,至少He is seventy if a day. (.一天也不差) 他确实有七十岁The enemy is 2000 strong, if a man. (.一个也不少) 敌军至少有两千人He measures six feet, if an inch. (.一?家膊簧? 他至少有六?崭?nI have walked 15 miles, if a yard. (.一码也不少) 我确实已走了十五哩if any即使有,如果有的话There are few (books),if any.即使有 (书) 也很少There is little (wine), if any.即使有 (葡萄酒) 也很少Correct errors, if any.如果有错误,即予以订正if anything要说有什么区别的话,甚至可能,说起来Things are, if anything, improving.事态甚至可能好转True greatness has little, if anything, to do with rank and power.说起来,真正的伟大与地位权力没什么关系if anywhere如有任何地方if at all → at allIf it had not been for ?如果没有…的话 (But for?)If it had not been for.? = Had it not been for your advice,I couldn'thave done it.如果没有你的忠告,我不可能完成那件事If it were not for?如果没有…的话 (But for?)If it were not for (= Were it not for) the sun, nothing could live.如果没有太阳的话,任何东西都不能生存if necessary [possible]如果有必要,如果可能I will do so, if necessary.如果有必要,我会这样做if not(1)即使不是…It is highly desirable, if not essential, to draw the distinction.即使非属必要,但仍然宜加以区别(2)如果不是…Where should I get stationery, if not at a department store ?.如果不是在百货公司,我该在哪里买文具?if only(1)→ conj. A 4(2)即使只…We must respect him if only for his honesty [if only because he is honest].即使只为了他的诚实,我们也必须尊敬他I want to go if only to see his face.光是为了见他一面,我也要去if you like → likeif you please → pleaseWhat if?? →what pron可数名词(pl. ~s)条件; 假设,假使There are too many ifs in his speech.他说话中有太多的“假使”ifs and buts事情延后的理由 [借口]Do it now, and no ifs and buts!.现在就做,不要尽找借口