substr截取字符串以后，ajax传到前台之后为空
substr截取字符串之后，ajax传到前台之后为空
substr截取字符串之后，ajax传到前台之后为空的，只有纯英文的可以显示，日文等要么整个为空的，请问这是哪方面的原因。
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json返回的？中文必须要是utf-8的编码才能json输出
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不截取时怎么样？
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編碼是否UTF8？
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以什么格式返回？编码对了没？
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请保持文件编码格式是无BOM的UTF8,php默认编码是utf-8,mysql的编码也是utf-8,乱码问题会远离你！
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