string转numberjava_number与string的转换

string转numberjava_number与string的转换// number -> string

// toString()

var num = 10;

var res = String();

alert(typeof (num));

alert(typeof (res));

// 加⼀个空格卤肉

var num = 10;

var res = num + ""

alert(num + ", " + typeof (num));

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alert(res + ", " + typeof (res));

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// 使⽤String(数字)函数

var num = 10;

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var res = String(num);

alert(num + ", " + typeof (num));

alert(res + ", " + typeof (res));

/ 没有固定精度的表⽰

var n = 1234.56789;

var s4 = n.toFixed(2);

var s5 = n.toExponential(2); // 指数表⽰

var s6 = n.toPrecision(2); // 有效位数

alert(s4 + ", " + typeof(s4));中秋法定假日几天

alert(s5 + ", " + typeof(s5));

alert(s6 + ", " + typeof(s6));

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/ 做除了加法以外的数字运算

var s = "12345";

var r = s / 1; // s - 0;

alert(s + ", " + typeof s);

alert(r + ", " + typeof r);

// 使⽤parse系⽅法

// parseInt() parseFloat()

var s = "08";

var r = parseInt(s);

alert(s + ", " + typeof s);

alert(r + ", " + typeof r);

// parse系⽅法，只识别⼀个字符串中开始的数字，如果识别不了就返回NaN alert(parseInt("a123abc") + 1);

// 使⽤Number()函数