Open ZhengXingchi opened 4 years ago
classNames('foo', 'bar'); // => 'foo bar'
classNames('foo', { bar: true }); // => 'foo bar'
classNames({ 'foo-bar': true }); // => 'foo-bar'
classNames({ 'foo-bar': false }); // => ''
classNames({ foo: true }, { bar: true }); // => 'foo bar'
classNames({ foo: true, bar: true }); // => 'foo bar'
// lots of arguments of various types
classNames('foo', { bar: true, duck: false }, 'baz', { quux: true }); // => 'foo bar baz quux'
// other falsy values are just ignored
classNames(null, false, 'bar', undefined, 0, 1, { baz: null }, ''); // => 'bar 1'
传入数组对象:
var arr = ['b', { c: true, d: false }];
classNames('a', arr); // => 'a b c'
传入动态class
let buttonType = 'primary';
classNames({ [`btn-${buttonType}`]: true });
在react中可以直接在classname内部传入动态class并进行条件判断
不使用classnames时的书写方式:
var Button = React.createClass({
// ...
render () {
var btnClass = 'btn';
if (this.state.isPressed) btnClass += ' btn-pressed';
else if (this.state.isHovered) btnClass += ' btn-over';
return <button className={btnClass}>{this.props.label}</button>;
}
});
使用了之后可以简化:
var classNames = require('classnames');
var Button = React.createClass({
// ...
render () {
var btnClass = classNames({
btn: true,
'btn-pressed': this.state.isPressed,
'btn-over': !this.state.isPressed && this.state.isHovered
});
return <button className={btnClass}>{this.props.label}</button>;
}
});
使用:
可以将后面的true省略,但这种我认为是比较直观的,可以对传入的class进行比较明显的动态判断