# 常规
# 取整数
// 转换为int '1' -> 1
const str = '1'
parseInt(str)
// result:1
const num1 = ~~20.15
const num2 = 20.15^0
// result:20
// 向上取整 Math.ceil(number)
const num3 = Math.ceil(20.1)
// result:21
// 向下取整 Math.floor(number)
const num4 = Math.floor(20.1)
//20
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# js去除富文本中的标签和空白
let html = '<div style="color:red">111<span>222</span> 333<a>444</a>555</div>';
html = html.replace(/<\/?.+?>/g, "");
html= html.replace(/ /g, " ");
console.log(html);
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