字符串截取

2017-05-03  本文已影响0人  可爱的木头
var n = 123456.789;
n.toFixed(0);           //1234567
n.toFixed(2);           //1234567.79
n.toFixed(5);           //123456.78900
n.toExponential(1);     //1.2e+5
n.toExponential(3);     //123456.8
n.toPrecision(4);       //1.235e+5
n.toPrecision(7);       //123456.8
n.toPrecision(10);      //123456.7890
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