需求:将全角字符串 " text001" 转换成半角字符串 " text001 "
var str = "text001";
var len = str.length
var newStr = ''
for (var i = 0; i < len; i++) {
var code = str.charCodeAt(i)
if (code >= 65281 && code <= 65373) {
var d = str.charCodeAt(i) - 65248
newStr += String.fromCharCode(d)
} else if (code === 12288) {
var de = str.charCodeAt(i) - 12288 + 32
newStr += String.fromCharCode(de)
} else {
newStr += str.charAt(i)
}
}
console.log(newStr)