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1. PHP对观察者模式的原生支持的代码详解

简介：

2. 有关CSS的高级布局技巧

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a

b

We hope to treat empty elements and non-empty elements differently, so there are two methods

3. CSS Advanced Layout Skills

Introduction: As IE8 gradually withdraws from the stage, many advanced CSS features have been natively supported by browsers. If you don’t learn them, they will be outdated

4. Fun JavaScript question: Adding large integer strings

Introduction: Many languages ​​provide native support for the addition of two large integer strings. For example, Java provides the BigInteger class, but JS does not support this aspect, so we have to rely on ourselves to implement it.

5. Python gdal tutorial: Reading raster data with gdal

Introduction: GDAL natively supports more than 100 raster data types, covering all mainstream GIS and RS data formats

6. Cross-domain technology (JSONP and CROS)

##Introduction: We found that when calling js files on a Web page, it is not affected by whether Cross-domain impact, any tag with the "src" attribute has cross-domain capabilities, such as

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