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function isNaN(num){ var ret=Number(num); ret+=""; if(ret=="NaN"){ return true; }else{ return false; } } 阅读全文
posted @ 2020-05-07 10:50
菜鸟程序员的总结
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<!doctype html> <html> <head> <meta charset="UTF-8"> <meta name="viewport" content="maximum-scale=1.0,minimum-scale=1.0,user-scalable=0,width=device-w 阅读全文
posted @ 2020-05-07 10:23
菜鸟程序员的总结
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