Math.abs(x)
:返回x的绝对值Math.pow(x,y)
:返回x的y次方Math.sqrt(x)
:返回x的算术平方根Math.round(x)
:返回x四舍五入后的最接近的整数Math.floor(x)
:返回小于或等于x的最大整数Math.ceil(x)
:函数返回大于或等于x的最小整数Math.max()
:返回参数中的最大值Math.min()
:返回参数中的最小值var str = "Hello World!!!"; var result = str.length; console.log(result);
var str = "Hello World!!!"; var result = str.charAt(6); console.log(result);
var str = "Hello World!!!"; var result = str.charCodeAt(6); console.log(result);
var result = String.fromCharCode(18888); console.log(result);
var str = "Hello World!!!"; var result = str.concat("你好","世界"); console.log(result);
var str = "Hello World!!!"; var result0 = str.indexOf('l'); var result1 = str.indexOf('l',3);//从第三个位置开始找 var result2 = str.indexOf('l',5);//从第五个位置开始找 console.log(result0); console.log(result1); console.log(result2);
var str = "Hello World!!!"; var result0 = str.slice(0,2); var result1 = str.slice(1,-4); console.log(result0); console.log(result1);
var str = "Hello World!!!"; var result0 = str.substring(0,2); console.log(result0);
var str = "He llo Worl d!!!"; var result0 = str.split(' '); console.log(result0); console.log(Array.isArray(result0));
var str = "He llo Worl d!!!"; var result0 = str.toUpperCase(); console.log(result0);
var str = "He llo Worl d!!!"; var result0 = str.toLowerCase(); console.log(result0);
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