js将小数转为整数的方法

document.write(parseInt("10") + "

");

document.write(parseInt("10.33") + "

");

document.write(parseInt("34 45 66") + "

");

document.write(parseInt(" 60 ") + "

");

document.write(parseInt("40 years") + "

");

document.write(parseInt("He was 40") + "

");

document.write("

");

document.write(parseInt("10",10)+ "

");

document.write(parseInt("010")+ "

");

document.write(parseInt("10",8)+ "

");

document.write(parseInt("0x10")+ "

");

document.write(parseInt("10",16)+ "

");

var decimal=4;

var integer = ~~decimal; // 4 = ~~4.123

console.log(integer);

console.log(Math.floor(2.5));  //2

console.log(Math.floor(-2.5));  //-3

console.log(Math.ceil(2.5));  //3

console.log(Math.ceil(-2.5));  //-2

console.log(Math.round(2.5));  //3

console.log(Math.round(-2.5));  //-2

console.log(Math.round(-2.6));  //-3