字符串转换数字 var a = ‘1‘; console.log(+a); console.log(a++); console.log(-a+3); console.log(parseInt(a)); console.log(parseFloat(a)); console.log(Number(a)); 数字转换字符串 var a = 1; a+‘‘ String(a); a.toFixed(); a.toLocaleString(); a.toPrecision(); a.toString(); 数组转字符串 var arr = [1,2,3]; arr.toString(); arr+""; 数组转数字,只能有一位,否则NaN var arr = [1]; ++arr; +arr; arr--; arr-0 arr.toString()-0
相关面试题:
console.log(1 + "2" + "2"); //‘122‘ console.log(1 + +"2" + "2"); //‘32‘ console.log(1 + -"1" + "2"); //‘02‘ console.log(+"1" + "1" + "2"); //‘112‘ console.log( "A" - "B" + "2"); //‘NaN2‘ console.log( "A" - "B" + 2); //‘NaN‘
原文:https://www.cnblogs.com/nini123123/p/10968562.html