console.log(hex2int("1df")); 十进制整数转换16进制 function int2hex(num, width) { var hex = "0123456789abcdef"; var s = ""; while (num) { s = hex.charAt(num % 16) + s; num = Math.floor(num / 16); } if (typeof width === "undefined" || width <= s.length) { retu...
functionHexStringToInt64StringConverter(signed) {varhexCode ={'0': "0000",'1': "0001",'2': "0010",'3': "0011",'4': "0100",'5': "0101",'6': "0110",'7': "0111",'8': "1000",'9': "1001",'a': "1010",'b': "1011",'c': "1100",'d': "1101",'e': "1110",'...
// boolean 12, // number 'haha', // string Symbol(), // symbol 20n, // bigint function(){}, // function {}, // object [], // object]for (let i = 0; i < arr.length; i++) { console.log(typeof arr[i])} 掌握JavaScript数据类型是...
Number String Boolean Undefined null Symbol Number 数值最常见的整数类型格式则为十 进制 ,还可以设置 八进制 (零开头)、十六进制(0x开头) letintNum =// 10进制的55letnum =070// 8进制的56lethexNum =0xA//16进制的10 浮点类型则在数值汇总必须包含小数点,还可通过 科学计数法表示 letfloatNum...
Int(hex =''){if(typeofhex !=='string'|| hex ==='') {returnNaN}consthexs = [...hex.toLowerCase()]letresInt =0for(leti =0; i < hexs.length; i++) {consthv = hexs[i]letnum = hv.charCodeAt() <58? +hv : ((code -97) +10...
Buffer.from()有多个方法实现,第一个参数可以传入ArrayBuffer | Uint8Array | string,如果是string类型,第二个参数为编码格式,例如实现编码转化 // base64 Buffer.from(str).toString('base64'); // 将str转base64编码 Buffer.from(str, 'base64').toString(); // 将base64编码转str ...
* @param {string} hex 16进制字符串 */functionhexToSignedInt(hex){if(hex.length%2!=0){hex="0"+hex;}letnum=parseInt(hex,16);letmaxVal=Math.pow(2,(hex.length/2)*8);if(num>maxVal/2-1){//这里是判断正负,最高位为1,就代表正数num=num-maxVal;}returnnum;} ...
(int).toString(16); // converts int to hex, eg 12 => "C" (int).toString(8); // converts int to octal, eg. 12 => "14" parseInt(string,16) // converts hex to int, eg. "FF" => 255 parseInt(string,8) // converts octal to int, eg. "20" => 16 ...
// String:'Hello'.toString(); // 'Hello'// Number:(42).toString(); // '42'// Boolean:true.toString(); // 'true'// BigInt:42n.toString(); // '42'// Symbol:Symbol('test').toString(); // 'Symbol(test)'重要的一点是打电话是安全的 toString() 任意 JavaScript 值 ，只要该值不...
在学习泛型时,遇到了一个小问题: Integer i = 2; String s = (String) i; Integer类型转换为String类型,本来想直接用强制转换,结果报错: Exception...in thread “main” java.lang.ClassCastException: java.lan...