var num1 = Number("hello world"); //NaN var num2 = Number(""); //0 var num3 = Number("0000123"); //123 var num4 = Number(true); //1
②ParseInt()函数
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var num1 = parseInt("123456abc"); //123456 var num2 = parseInt(""); //NaN var num3 = parseInt("0xA"); //10 var num4 = parseInt("22.5"); //22 var num5 = parseInt("070"); //56 var num6 = parseInt("70"); //70 var num7 = parseInt("oxf"); //15
③parseFloat()函数
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var num1 = parseFloat("123abc"); //123 var num2 = parseFloat("0xA"); //0 var num3 = parseFloat("22.5"); //22.5 var num4 = parseFloat("22.34.56"); //22.34 var num5 = parseFloat("0908.5"); //908.5 var num6 = parseFloat("3.125e7"); //31250000
转换为字符串
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var age = 18; var ageAsString = age.toString(); //""
var flag = true; var flagAsString = flag.toString(); //"true"
var vv = "hello"; var ww = vv + "world"; //"helloworld"
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