parse.js

来自「这是《JavaScript学习源代码》一书的源代码」· JavaScript 代码 · 共 17 行

// create a string beginning with a number
var str = "66.6% PASS RATE";

// extract the initial integer value
var res = "Integer : " + parseInt(str);

// extract the initial float value
res += "\nFloat : " + parseFloat(str);

// create a string beginning with a letter
var badstr = "PASS RATE 66.6%";

// attempt to extract an initial integer value
res += "\nNon-numeric : " + parseInt(badstr);
res += "\nFound : ";
res += isNaN( parseInt(badstr) )? "Character": "Number";
alert(res);