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1、该字符串为全数字
var s = '123'; a = s.substring(0,1); //str console.log(a)
结果:
2、该字符串是字母+数字
function getNum(str) { var pattern = new RegExp("[0-9]+"); var num = str.match(pattern); return num; } function execute(){ var inputStr = "asd2xde3"; var x = getNum(inputStr); document.write(x) } execute()
结果: